Zee5 — cashback not received

Address:

560043

Hello sir,

I have opted for zee5 annual subscription on 1st august 2019. While taking the subscription, it was clearly mentioned that i will get 30% cashback from amazon. I got a message from zee5 for the same as well but now they are refusing to give the cashback and telling me that cashback was valid till 31st july only. But while making payment, i clearly saw the cashback offer was showing on their application. Can you please help me in getting the cashback. I have sent multiple emails to zee5 and also contacted amazon pay customer service but no one is helping