MTN, please somebody help me!!!

I regret having entered into a contract with MTN on 4th May 2021 as I have yet to receive a statement of account which was supposed to be emailed to me on 27 May. I have called customer care several times to email the bill which I still to date have not received. The MTN app for IOS fails to send my account on request too. The worst of all is that it appears MTN have overcharged me as I'm on Sky contract for R999 per month and I was charged R1643 which was debited to my account and I have not exceeded the free minutes or data.No-one but no-one from MTN can assist me. I should have stayed with Vodacom.