Poor customer service

I am out of words about how disgusted I am about the way telkom mobile treated me as a customer. I have a R99 data contract with them that was on a month to month basis but in March they started debiting more than we have agreed on. The first amount was R269 and it continued increasing until today when they took R3253. 84. I did visit a branch and the staff there checked for me and they told me that I had contracts that I have since canceled them and I am being charged for cancelation. I submitted an affidavit to validate my statement that I only have 1 contract with them and know nothing but they can't stop debiting me. Today the 18.06.21 I visited the branch in greenstone and the ladies there told me that it can take up to 6 months for the matter to be resolved. This is so frustrating because it means I will be losing my money for that period which is going to be a nightmare to get it back if I am lucky. This is absolutely unacceptable and I need some answers.