Sim swop on new phone not done after 8 weeks

We have been Mtn clients for many years and regularly upgrade our contracts. On 18 May 2015 I upgraded again. As my new phone requires a micro sim card Mtn had to do a sim swop from my old sim card to my new one. After 8 weeks I am still waiting...and cannot use my new phone. I was told by Jessie at the Mtn shop that the problem lies with the call centre. I trade at festivals and need my new phone to use my ABSA payment pebble card facility. I bought a Vodacom sim card to use my phone and card facility at a recent festival. We have been paying more on this contract fort 2 months now and has not had the benefit of the new phone. Eight weeks are really unacceptable for a sim swop to take place!! We have to upgrade our son's phone contract now, but are seriously considering changing to Vodacom.