OnePlus India — worst experience with oneplus 7t

Address:

Thane, Maharashtra

Today i visited one plus service store thane branch for various complaints i am facing since i have purchased one plus 7t (Purchased on 04/10/19). But after sale service, the executive told that it was just a software problem and we have fixed it. Having trust on their words still i am facing the same problem after reaching home, problems are stated below
1. Charging problem
2. Hang
3. Phone getting off often

I want a replacement for my product asap or else i will file case in consumer court