Concerned frustrated and very upset cell c customer

I had a terrible experience with cell c today. At 11:00am today 9/01/2020 I called to tell them that I set a limit in October 2019 on my cell c contract and they have charged me fees that have exceeded my limit. When I queried at first a very inefficient lady by the name of silindile started telling my that they charged added disconnection fees and other fees on my acct. My account has been paid on time by debit order every month so I did not understand and neither did she understand why the costs were being charged to me. I then asked to speak to her supervisor who came on the line 20 minutes later. His name was sifiso. I explained that there was a limit on my account which I placed in October 2019 so why did the account exceed the limit. He explained that cell c had charged vat on the extra bundles that I had purchased which exceeded the limit. I then said that the message should have come through to me that my limit would be exceeded or there were inefficient funds to purchase bundles. Cell c did not inform me that my limit wud be exceeded and vat charges would exceed my limit. Why do customers place limits on their accounts if cell c exceeds them on their own without informing the customer. Sifiso said he would investigate all the charges on my account and get back to me. I am still waiting urgently as cell c is still charging the vat charges which exceeded my limit for the bundles I purchased. They did not tell me that that vat would be charged over and above the bundle costs. Cell c I and still waiting for you to get back to me as this is very inefficient and *********** service delivery. Plus your normal consultants are not trained properly and take very long to understand customer queries. This is very very very frustrating. Please help help help help to resolve my query.