Payzapp — cheated customer on cashback by providing false information

Address:

flat 301, RK Residency, Vinayaka nagar colony, Puppalaguda, Manikonda, Hyderabad, Andhra Pradesh, 500089

I had a payzapp account for my mobile [protected].
I have done 4 transactions on big basket app with promo code grocery, for each transaction i should get 25% cashback.
In november 2018 i have done transaction on big basket and waited for cashback, but i did not get it. So called customer care for this then they informed my wallet limit exceeded, amount will be credited in next financial year automatically.
With this answer from customer care i have done 3 more transactions on bigbasket with payzapp as i will get the cashback in april 2019.

But when i called the customer care on april 2019, they are saying you will not getting the cashback as wallet limit exceeded in last financial year.

Please help and get me my cashback approx 800 rupees for 4 transactions. For my payzappp account [protected] and contact me on same number