Flipkart — Offer coupon not working and customer care nit solving the problem

I puschased a zoomcar coupon on the flipcart site the coupon stats 50 %flat off and 70 %cashback now when i tried to use that coupon it says expired but the coupon expiry is after 30 july 2020. When i contacted the customer care on 28 june 2020 they told me that it would be resolved till 1st july but on 2nd july they message me that it would be solved till 2nd july till 09.00pm but not solved after this i agin contacted customer care again they told me it would be solved in 24 hr or 48 hr then i waited but no result after this i again tried on 6th july the same reply i got from the flipcart customer care no proper response from them just same answer which is of no use
I have tried 3 times to contact and my problem is not solved till date kindly help me regarding this. My number is [protected]