i want to cancel my employment visa.

hello, i have a question regarding my work:
well, the story goes like this.
i was in a tourist visa before, i applied in a medical center, two employees of the center interviewed and recruited me. the offer is low, even though im a bachelor graduate, well I accepted it, because one of the employee who interviewed me looks nice, she said to me during the interview that if they hire me, they dont want me to accept any other job offers, or lets say that me calling them telling that i cant accept the offer because the other company offer me a higher salary. well me, being a first timer here in uae, i accepted the offer, because i said to myself that it is my first time, and i cannot demand a higher salary, one reason also i said yes because one of the employee told me that ill be working with her on a straight duty.. she even said that no one can harm me, they said they can only offer me 1500 dirhams thats all.. because of the good aura that the other employee show me, i accepted the offer knowing that even if the salary is low, i know they are good person.. two weeks before the expiration of my visa, i already gave them my requirements, i rejected other offers because i want to keep my word that ill be working with them.. when the day comes that i need to exit, they said they already processed my visa, i just have to wait. but they lied 2-3 times saying that they processed my visa, i stayed in oman for almost 20 days, with lot of expenses.. but during my interview i wasnt able to sign any job offer or contract.. when finally they processed my visa and it has been already approved they ask me immediately to report to them.. i had there 4days of training, and according to my visa my position is archives clerk, i was then shock that i was given multi tasking work.. it feels like all their works are given to me, reception, assistant of the HR, assistant for the HIM, billing coder, medical coder, now supervisor in cleaning, almost everything.. the person that i said was nice turned out to be a bad person, she scolds me for little mistakes, gets angry with me, even for a small problem that i didnt create.. she blames me almost all the time.. one time, she got mad because, she is yelling in the another employee, and asking something, but the employee didnt understand what she means because they are of different nationality, and sometimes its hard to understand you know because of different language. i explained to the other employee what she is telling in our own language, she got mad because i was degrading her because im talking in our own language in front of her, she didnt hear my explanation, she automatically got mad at me, even though i was just explaining to the other employee what she means in order to avoid mis understanding, and now it turned out to be my fault. she said she doesnt like me and she will transfer me to another department next day.. and when the next day came, it seemed like nothing happened, i apologize to her, and she even apologize to me.. that is what im waiting for, but i didnt mind it anyways..
another incident happened yesterday, she was on a leave, i wasnt informed, but we saw each other outside work, and told her that one of the boss, the female one, asked for my report for my first month, she said okay put there what you learned from me.. i said yes mam finish.. and in the afternoon she came, i thought she just visited i didnt know she came for a duty.. and later in the evening, she again got mad because, why i am submitting my report to our female boss, without her consent, i cannot answer her because she is my head and i respect her.. i didnt even know that she wants to read first my report before i submitted it, i gave her a copy and she even got angrier because my report is all about multi tasking work and said that she dont need a staff under her doing multi tasking work..

the problem is this, first, they said ill be in a straight duty, but then not, they only give me 1500 and everyday i have to spend 8dirhams for the bus, i have to wake up early to catch the bus because it will take 20dirhams per ride if i take by taxi.. i didnt mind it because i said, ill just have to live with it because i have no choice, second the male boss told me to work under her, my head/supervisor, the other boss the female one told me to do reception, hr, supervising the cleaning, etc.. and then my head is angry with me, becuase im doing multi tasking work, i dont understand who really is my boss in them, who i will follow, my point is why dont discuss it together instead blaming all of this to me, im just following orders to those who are higher than me.. im so stressed..

i want to cancel my visa, i am just 1 month and 3 days from the company, i cannot live and work like this, i am in unlimited contract, im afraid i have to pay a lot of expenses, i am still in debt to my relative because i owe them money so that i can travel here in uae, and now i think if i will cancel i will be banned, please, i need advice.. help me.:cry: