Disgusting customer service wrt an upgrade!!!

Absolutely disgusting service from MTN - in fact, NO service at all! I have been sitting with an upgrade query since 17 July 2022 (going on 3 months soon), and all I ever get, even when contacting MTN via facebook, is that the matter has been escalated, and I get the reference number I-*** and am advised to contact them via 135. There is no option, when dialling 135, to contact the relevant department for the specific query in hand. MTN has messed up with my account BIG TIME and I need it sorted ASAP!!