Telkom Mobile and Accounts very useless

Telkom is useless, had a very bad service. I when for an upgrade in January . After my upgrade, my first installment was supposed to be R1200 but Telkom said my instalment for February is R6800 . I lodged a complaint before they deducted and they gave the case number. Come end of February they debited R6800 while there was a case opened. I had so many debit orders bouncing , my policies and loans. I fine them and they said the case will be resolved within 2 to 4 days. It took them 2 Weeks to resolve the case and I still had to fone them for my refund, which they said they have to lodged another case for refund. They did lodge a case and said it will take 2 days . I waited and nothing happened , I called they so many times and I was taken from Pilar to post . I had to borrow some money to pay my debit orders and changes . One day I spoke to an agent who gave me a very bad service, she said her name was Abongiwe. I asked to speak to a supervisor ,I couldn't even get one or a call back at least. It's like no one care about customer complaints at Telkom. Am not sure anymore what can I do the get my own money back . If it was who owes the money my would be off the next day. Am angry as hell now