Vodacom refusing to refund

Vodacom promised to repay me the amount I overpaid. I spoke to them on the 25th July and I have been following up with them on a daily basis. They haven't paid the amount as promised and refused to talk to me. They only make promises through their social media desk. They refuse to provide me with proof of payment as they allege they transferred the money on Friday 07th Aug. there is no complaints desk or consultant to speak except customer care that isn't authorized to deal with this matter and can't put me through to accounts \because my account isn't in arrears"."""