MTN poor service after 23 years

I have been a MTN customer since my first phone since 1997 . I was contacted the 14th of May by Tshepo Mosielele to say I am due for an upgrade and need to sign a new contract. This is for account A*** for my business Gautax. I send all the documents on the 17th of May. On June 3rd MTN's couriers call me once and could not get hold of me while i was in a meeting. Needless to say after a few emails and my dissatisfaction with the poor service I was notified by the DSV their couriers that the upgrade phone was sent back to MTN. I sent emails to Tshepo and MTN Complaints with no reply. Today is the 10th of June - almost a month later and no phone. I am now considering to cancel the upgrade and move to Vodacom