Bad customer service from MTN

I ordered an s24+ online on a contract deal and an s23 was delivered to me, I tried calling MTN costumer service numbers to arrange for the issue to be resolved, non of numbers are answered, I sent an email, they asked for my ID number and that was the end of their response. It is appauling that I now have to struggle without a phone and the service provider MTN doesn't seem to care. Furious. This is really causing a inconvenience for me because I urgently need a phone