pathetic service toward paying customer

As per call, i was promised that the entire day of 6 march i would receive an stpc voucher for my travel. upon agreeing and making the booking, aftwards i got told that i do not qualify. Have waited 22 days for any sort of feedback from manager julian sibeko, who just couldnt care about any customer service. before even playing call, i get told i am wrong!!! have flown many many times with qatar, but this will be the last. such pathetic serivce, and loss of customer over an issue that could so easily be resolved. what loss is it to you to fix this matter vs the bad reputation and publicity you will receive? really disappointing, pathetic service.