[Resolved]  Bajaj Finserv — Cashback not being credited and my queries are being closed without resolving

I had purchased samsung tv on Diwali 2020 through Bajaj Finance and there was scheme for cashback. I paid electricity bill of Rs. 500/- as there was cashback on it for 1500/-. I applied the coupon when making the payment and it was written that you will get the cashback in 48 hrs that was on 2nd July 2021. From 3rd I have been raising query with them ane I got call for 2 days and they hang up on my face while I was taking to them and after that they closed my query stating resolved. i have made a number of complaints to them and they close my qyery without even calling me. On the other hand everyday I receive a call twice for their credit card but nothing for my complaint. Now they have added some query on my account from their side which has no relevance to me as it says for a death certificate for someone I dnt even know. Their service is ridiculous and they are not giving cashback but sending msg for voucher links. This is ridiculous. I have more coupons but now I am sure they are all bogus. Also the new msgs that they are sending me has a validity of[protected]. How do I go to year 1900 to claim it.