Airtel — OTT subscriptions with Airtel black plan not received.

I offered Amazon prime for 3 month at the time Airtel Black subscription, Same had been confirmed from Airtel Sales manager & customer care. But OTT offer not reflected in Thanks banner in Airtel Thanks app. After registration of couple of complaints customer care saying that Offer is not applicable on your plan. then I raised issue with higher authority, higher authority issue the OTT offer to me & confirm the same with SMS, but still Thanks banner is not reflecting in Airtel Thanks app. Very worst app i have been ever used. No one give proper information from customer care team. I think Airtel dont need customer base. Very bad service from Airtel & totally mislead.