Telkom Bad Service on refunding and total service

We had a wifi line with them for a few years. Cancelled due to not having the product but paying the full amount. Few months do e the line i get a call from Nu Debt saying telkom has handed me over for the amount of R1600 and something. I arrange payments. Make all of them, month and half ago i think to myslef that this is suppose to be paid up already i want a statement and letter that it is done. Phone Nu Debt, just for them to say that telkom has taken back the account. Ask the gentleman how is this possible. He states that telkom does this if they see you are paying. Now except for my letters i want, i want to know who gave them the authority to take it back after they now smothered my name. Ok so the dude says phone telkom they will be able to assist you. Mind you when i phoned Nu Debt they couldn't find me on the system. So phone telkom after numerous person the lady said i am in credit with R698. 30,so i said ok did you receive the weekend before payment, she advise me that i phone back in a week to do 1 refund as it takes up to 21 days for them to return money. So phone again after 2 weeks and now my refund is R998. 30 WHY 21 DAYS AFTER IT WAS SO EASY FOR YOU TO TAKE MY MONEY AND NOT EVEN INFORMED THAT I HAD CREDIT, IF I DID NOT PHONE WERE WOULD THAT MONEY GONE. OK so i phoned last week again, got the case nr for the refund they will be in touch within 72hours to tell me the proceedings. No phone call was received. I phone today just for the lady to tell me it was closed the case due to not receiving the proof of payments. When i lost my mind asking but how when and who phoned me no reply just diverted to i dont know were. I want to know where isy money i will not wait 21 weeks. You TELKOM ARE *******. I even sent emails to different departments to get some feedback. As they are not paying my phone bills till today no feedback no money. TELKOM??????