APPALLING Service and THEFT by Debonairs!!!

I bought R500 worth of Debonairs vouchers from the MTN store. The same day I wants to sue them to pay for an order at the Grosvenor Crossing Debonairs. Their system does not allow for any order to be paid for by the Vouchers I bought the same day from MTN. So, WHERE and WHO has taken the money I used to for the Debonairs Vouchers??? Either Debonairs and its owner Famous Brand or MTN has just committed ***** and Theft!!!