Always a catch in fine print

I took a black friday special 3 years ago and subsequently ended and my bill skyrocketed to 300% payment. I called cancelations with a view to cancel but I was told to take another deal so that everything will be fine. I was excited and told the person to set up...tge salesman stated that he will put me to another department to adjust prices but the call was cut. I immediately called cancellations and another person stated i did actually get a new contract then I released I still had to pay 300% at the the end of month. I asked the salesperson to cancel all deals and he said it cannot be done I just have to pay. I want to cancel but no assistance is given