Call me for upgrade then dissapear

I have been contacted last week by a gentleman with regards to upgrade eligibility. He called me and we apparently did the upgrade telephonic ally, but until today I did not receive any confirmation, communication or anything from MTN. When I call 808 It directs me to the one2one call centre. I do not have a contract with Foschini and MTN I only deal with MTN. I am at the point of taking the matter further as there are no comms from MTN.