Contract upgraded with incorrect information provided by agent

My one MTN contract was upgraded but the consultant confirmed that another pre-paid phone number can be used on the upgrade, but that is not true. You can not do a simswop to a upgraded number. I phoned MTN helpdesk numerous times, logged calls with no success. The service desk who done the upgrade is called "the ignition group" with no success I tried to contact them numerous times on ***, *** and ***, unable to speak to anyone....message business hours form 8 - 5, even when phoning in that time you get the message. Emails were also sent to *** and *** without any response. Please please assist to get this contact cancelled with out fees as it was done with the incorrect information