30Gb data for 3 months if you upgrade tonLTE devic

My husband upgraded one of his contracts with MTN ***. It was said to us that I would receive 30Gb of data, we also received messages stating this. We phoned and followed up why we haven't received the data yet, the lady said she would look into it but it wouldn't take more than 48 hours. After almost 5 days we followed up and spoke to someone else. She got back to us saying that we didn't qualify as it was only from the 15th of October, but I received this message the first time on the 10th, how is that possible. After the bad service we received the past months during the strike at MTN we were still loyal and upgraded with them, although I was phoned a few times from other service providers to switch the contract to them. I feel MTN will always look for excuses to get out of something. Can't remember to who we talked but the number we had to phone was ***and the reference number ***. I feel this is unacceptable and I want the data to be loaded. Will appreciate if someone will sort this matter for us. The contract is on my husbands name and his contact number is ***.