Pathetic service from MTN

I've never dealt with more *********** people in my life - I had taken out an MTN contract and requested to be ported from Vodacom to MTN. However, on the same day, i cancelled the MTN contract and requested to be ported back to Vodacom. I was notified that the contract will automatically cancel once ported back to Vodacom and I would be moved off the MTN billing system (on 30 November 2020) - however, despite porting back to Vodacom in the first week of December, I have been billed for December, January, February and now i will be billed in March by MTN even though i am on Vodacom and have never even been active on the MTN network. I had to spend hours in your store waiting to see a sales rep to sort out the issue only to be told to go to the bank and request a debit order reversal (of which there is a R50 charge) and receive continuous SMSs from MTN that i have not made payment - i then received an e-mail from the sales agent in early Feb indicating that my contract is cancelled and she had requested a reversal of the amounts charged - yet i was billed in Feb and now will be billed in March. I emailed her indicating that i was being billed and then did not receive a response. To top it all, during January I could not make any calls or receive calls from MTN numbers - which caused me grief from a work perspective. I will never ever ever move over to MTN nor recommend that anyone i know use MTN - absolutely useless!!