FED UP WITH VODACOM!!!

It's the 3rd time complaining about vodacom I might as well cancel my contract with them😠😡! Each and every month I have to complain about being over debited on the amount agreed on!!!! A few months back I complained and they promised they have fixed my problem. Last month I complained again. And they apologised and said they will calculate the difference and transfer the over debited amount to this month's bill. Today I get an sms over debited again not the R350 we agreed on😡😡😠😠😠! Il be canceling my contract with them. And I'll tell all my friends and family not to join these ****mers