Flipkart — Regarding deny in approving return request again and again

I have ordered an INTEX MUSIQUE ENVY BLUETOOTH EARPHONE order I'd: OD[protected] from Flipkart by paying 899 but when I got that, I found there is sound problem along with connection problem. Then I send return request to Flipkart from 1st day of delivery, but each time my return request is getting cancel after a long time of pending. Yesterday I send last return request because yesterday (26/08/21) was last date of my return. If it will get cancel, then I will be ruined. My last return I'd is[protected]