Sony India — sony power bank denied getting replaced even after providing invoice.

Address:

Thane, Maharashtra, 401303

Hi, Team.

I have purchased Sony power bank and it was not working within the warranty date, however, submitted it to the customer support from Virar West, which was on Aug 7th 2019.
While the time I handed over my repaired power bank, I was said, that, I would get it replaced within 4-5 days, however, it didn't happen, since they said that, I would have to wait as the warehouse didn't have alternate product to get it replaced. After 15 days, I was told that I would get the same model but with different color for which I was asked to write an application and send it over to them via email, I again waited for next 10 days, after 10 days of continuous follow-ups, I was said, that the power bank which they offered me with the alternate color is also out of stock hence, I'd receive my refund. Now after 10 more days of wasting, in total which goes around for almost 40 days, I was said, that, I haven't submitted any invoice bills, and they wanted me to show the box of the product to prove the genuinity of the product, now who would hold a product box for almost a year?

My Service job number - J91457201
Please help me out from this issue.