13 days later and still nothing!!!

I have been a MTN customer for over 20 years and have never had to deal with such bad service from them or actually any service provider. On 27.12 we took out a contract for their WIFI special. We were advised that the activation of the sim card would take between 2 to 24 hours. More than 24 hours later I called (on 28.12) and was advised that a call would be made to the call center (I dealt with the lady directly at the MTN shop we had signed up at). Still nothing! I called again on 30.12 and was again advised a call would be made. Still nothing!. I then went back to the branch on 02.01.2018 and after a call was made while we were there we were again advised that we would need to wait another 3 to 5 working days. You guessed it STILL NOTHING!!!. It is now the 13 days later. The promotion included 5 free Gigs which needed to be used by the 08.01.2018 which we have now lost as yes STILL NOTHING!!! I do not which to name the branch or the people I have dealt with at that branch as in my opinion their service was exceptional. MTN surely you are now breaching a contract which we agreed to, ie you provide a service and we pay!! What need to be done to get the sim card activated so we can start using the WIFI. Surely it cannot take this long?