Mivi — They take our product to repair but now they are not returning it and not replying mails

Address:	Plot No, 29, Rd Number 76, Jubilee Hills, Hyderabad, Telangana 500033
Website:	www.mivi.in

I ordered a mivi product (collar classic earphones) on 4th may, 2021, But there was a problem with that product. Hence, we file a complaint for the replacement/repair of the product. They pick up our product on date 25/07/2021 and it is about 1.5 months but they didn't repair our product nor delivered it yet.
I sent them a lot of emails but they are not responding to anyone and they didn't even take our calls.
So I request you to kindly look into this matter.
I would be grateful if you help me take our product.
also attaching the invoice.