Realme — Buds air 2

I have purchased realme buds air 2 (BLACK) worth rs 3299 via Flipkart on offer price of rs 2999 in August 2021. By the time I got the product, the right buds were non functional.
After tremendous calls to realme service and Flipkart I got it replaced. Unfortunately the right bud stopped
working after 2 months.
Due to lack of time I wasn't able to take it to the service centre.

I have given them for replacement at the realme service centre ( GEECELL )at Trivandrum on December 16, 2021.
I was asked to wait for 2 weeks.

On the 29 th of December 2021, I got a call from the service centre and was informed that black color variant isnt available, and they are not sure when the Black ones will be available.

They enquired if I am willing to take the white variant. I denied to take the white variant.

I called the customer care on the same day (29/12/2021) and my complaint was registered by the agent and assured me of getting the problem solved within 2 days .
But they haven't contacted since then.

On 11 January 2022, the service centre informed that as the Black Variant is not available they will give me a coupon worth the amount of the Buds air 2 and I can use the coupon to buy the same product or any other REALME products. I denied to accept the coupon as I am tired of the poor quality of the product.
Today (12/01/2022) I contacted the REALME CUSTOMER CARE and demanded refund for the same, but they denied my demand as the Brand doesn't have refund options.

I can't afford to buy the same product again, just to deliver it to the service centre for the poor quality repeatedly.
3000 rs may be a small amount for them, not for me.
There is no assurance that this won't happen again.

Kindly help me out in this matter.

Thanking you
Dr NANDANA