MTN Customer Service

Who do you call went customer service is not customer service? Phoned customer service twice on 19th May about transaction on my May 2021 account. I filled in and submitted the requested affidavit. Phoned again twice on 7th June. Was assured that the amount (R3900) would be transferred off my account. It didn't happen. This amount was debited to my bank account. A further R522 was incorrectly added for the following month. Customer care isn't customer care. In the mean time I am out of pocket by R4422. Where do I go now?