TERRIBLE CUSTOMER SERVICE

I have a credit balance due to me from Telkom because when I settled the account I paid more than the balance I owed them. The contract is cancelled it cannot be added to a Telkom account because I don't have any. I've been calling the billing department and the 1st agent said it will reflect on my personal account that they used to debit within 72hrs, that was 2 weeks ago. The other agents have been sending me to the store, at the store I am told I need to call billing as the store only deals with sales. This has been going on for close to 3 weeks. I can't do this anymore. WHAT CAN ONE DO TO BE ASSISTED BY TELKOM AND NOT BE GIVEN A RUN AROUND!!!!!!