Telkom's payment hikes without a valid explanation

Dear Peter. I have a serious problem with Telkom as they are busy increasing my contract payment as they are saying i have subscribe to an unknown provider. I have reported the matter more than five times and requested that they cancel whatever subscription that is attached to that contract, they failed to do so. i have been paying an increased premium for more than 8 months now and I am not sure what to do now. If I had the money to pay up my contract i would have long done that and cancel my relationship with them because the are not able to resolve issues that impact our daily lives. Iv'e had enough!!!