OnePlus India — Not Giving My Product Back No Response taken

I bought OnePlus Wireless Earphones Worth (2000) On
[protected] But . After 3 Months it was no working properly.
It was in Warranty. So I requested a repair Service To OnePlus They Took My Product On 3rd September 2021. But Till Now They are Not Giving my Product back They Are Not taking any action. it has been more than 5 Months. I have talked more than 100 times to Customer care to Give My Product Back.
They Only Say Wait. They say your product has received to us but we don't have update on it. Case No Provided by Them[protected]
My Way Bill No- [protected] ( Product taken by bluedart on behalf of OnePlus)