Overcharged and mis sold a contract by Vodacom- Useless costomer care

I was mis sold an "upgrade" which was actually a downgrade AND more expensive. After trying for 6mnths to get them to actually listen to the recorded call they finally acknowledged that they had done so. As a result I cancelled my contract and went back onto prepaid but I have a R380 credit on my account which they said they would refund ..... but after ***0 calls to their call centre (and also to the utterly useless "tobi bot" I still have not received my refund.