Deduction of overpayment

Hello. Just had a bad experience with Telkom for the past 2 months. Today they just excel. I was having an account for mobile data then I decided to close it in the month of September this year. After 2 days closing it they did a debit order of R1600. I called to ask them to reverse the money cause it was overpay, they told me to wait 7 to 14 days, all that happened in September. It's been 2 months and days without reversing the money. I went to my bank to block them from taking debit order. But today they went above that law and took the money. But I don't owe them anything. So far they have done two debit orders which are over payments. The total it's R3200. They are telling me waits another 24 to 72 hours for them to return the money. After waiting for 2 months for them to return the first R1600 they are still telling to wait for another days. No this is not acceptable and I'm tired if waiting since I don't have any business with them. They are busy sending me case numbers Please send help