MTN not coming to the party.....

Very poor service from MTN, I transferred the account to my name last month. I then went ahead to do my upgrade on 11/01/2021. From then I was unable to connect to the internet via mobile data. After numerous calls to MTN since then which took at least 30 min each time. the problem is still not resolved. I then get a invoice that has pro rata charges that costs more than the original contract I was on before the phone was payed off. Thereby I get charged for the transfer that was also not disclosed to me when requesting the transfer. Additional to all these charges I get Billed for the new package that can't be used due to their support team that are not able to rectify the problem. Has anybody had a similar issue with MTN? I am at the point of losing all confidence in the service provider and at this point will not refer anybody to use MTN.