Very bad service MTN Cancellation Department

Yesterday I spoke to one of the ‘champions’ in MTN's cancellation department, Phumlani Qayiso. I requested him to migrate a phone number on my account (currently on MTN Mega Talk XSTopUp), to My MTNChoice Zero. When I received the SMS ( order ref ***) later confirming the transaction, I learned that another phone number, also on my account (currently on My MTNChoice 2GB), was migrated instead. I tried to phone their call centre again this afternoon, spending more than 30 minutes on the phone, without success and a high blood pressure afterwards. Afterall, it's a nightmare to deal with MTN's call centre due to bad connection and sound on their side, people laughing and chatting in the background and a very slow system.