Vodacom only cares about sales

Good day. Vodacom service is so terrible, I have an account that I have been trying to cancel since last year October, I was notified that it will automatically come to an end in March and I decided let me just wait for March. March come and I found out in April that they were still billing me and my account was now in areas, because I never used the SIM card I didn't know the number I struggled so much to get information about the contract from them because I didn't have the number until a lady eventual decided to check my account using my ID then the second problem started when I couldn't make a payment to them because the tellers are not interested in you of you are not buying, eventually I paid using a speed point and the lady told me that them assisting me gets into the way of them selling, so basically I am wasting their time. Then in may my account was sitting at 0 I told them to close the account they said they will close it in 19 days and a final billing might come in. June I checked and I found I owed 406 I paid the amount, but guess what I listing was done on my name in July stating I need to pay 871, I call Vodacom I get told my account is now prepaid, I call collection I get told I got billed again. When does this stop