****ty Service from CELL C

I have paid R3900 for cancellation of one of my contracts in April of this year. Pursuant that, I cell c wonderpark forwarded the the cancellation documents to your head office on my behalf. That was on the same day I made a payment. At he end of April 2018, you did not bill me for the two remaining contract and I called you to ask, it was said to me that the cancellation amount I had paid was too much and will cover my bill. The say happened in May of 2018, I it was for the same reason. But no, end of June 2018 you deduct from my account R2400, when I ask I am told its for cancellation..which cancellation??? Why was I not pre informed? now I get some ****ty attitudes from the consultants when I ask questions?? I have been Cell C 's client for more than 4 years but I now will be canceling the **** out any contract i have