Horrific experience with Vodacom!!!!

After my previous complaint about Vodacom - someone phoned me apologised and ensured me my refund would be made in the next 5 days. That was on the 14th of May. 10 days later nothing from Vodacom. I’ve sent numerous emails to them - the only response I got was they will query it with accounts. I do t know what else to do. They continue to deduct funds from my account- do not want to refund me. This has been ongoing since end of my 3 year contract with them end of Feb 2024.