Waiting for Refund for 26 days

I have been waiting for a refund since the 1st of April 2021, Telkom customer service is terrible, I changed banking details to Capitec. Capitec notified them of me changing banks they did not reply to Capitec I manually made a payment. December, January and February they didn't debit my account I have bank statements to prove my claim. They even suspended my services for their errors and only in March they debited but not on our agreed date after I had made a EFT payment which took 3weeks to be allocated. I don't know the process at Telkom but they really have to start acting like a business that wants to keep client. If I had money to settle I would cancel my contract today.