Contract issue

Good Day My name is Gugu mkhwa**** , i took a contract with Vodacom in Jan this year which was for two phones , got them paid and my payment option was debit, though February, March and April money wasn't debited out of my account even went to the voda store to pay and lay a complain about it and they said it will be fixed but it wasn't, and even changed my payment option to pay directly, though now what's puzzling is that I am on areas which i dont know and wad created by yall , i even called the customer credit department i was not helped, even went to the westgate mall voda shop and they said i must bring my bank statement which i did and they sent it to the credit department, and i will be informed about the next step going forward , but till today no one has sent anything regarding my matter being solved cause u won't pay for mistakes done by your side and i need this matter resolved cause im now being called that ill be blacklisted for something i didnt do , and i have been with Vodacom for more then 10year's and this is how we are treated as y'all loyal customers this us totally not on.