Bad Service, Wrongful Debits, Account blocked etc

I have been to Irene branch over 10 times in the last two months trying to sort out my account. I opened my contract at the end of January for an Ipad Air 2. Everything went smoothly and i was told it would come off my account at the end of February with the Pro Rata amounts for January Which i was happy with. When i opened my account i clearly requested that its a closed account (Prepaid) and Freddie told me it was and i dont have to worry. Come end of February an amount of R1900 comes off my account!I asked Freddie why and he told me i went over my gigs. I asked him to recall me clearly asking him to put it as prepaid and he apologized and said the store will pay the difference and i should reverse the debit order with my bank. Which i did. I asked him to please sort it out asap and he said he would. I then opened another account for an LG 3. Which again went very smoothly. But now suddenly i start receiving smses on my phone telling me i owe R1900 and if i dont pay they will suspend my service?! Then on the 25th of March they suspend my phone connectivity and now im sitting here with a useless phone! But thats not all, On the 25th of March two amounts go off my account! Fed Up!