Mivi.in — Warranty claim not getting response from last 1.5 months

I bought mivi Collar 2 earphones from mivi on 18 march 2021 with 1 year warranty. Due to some technical faults the earphone stopped working on 23rd June 2021. I have sent them the original bill provided by Amazon and the other details.
After that they picked up the product on 1st July, I got automated mails from them but never received the final date that the product will be delivered or returned by this date. They are just sitting on the product and not responding to calls also.

I request from them to repair the product or it will not get repaired then provide me the new Product.