Apple India — IPhone manufacturing issue - Fraud reseller

I bought iPhone 12 in the month of March 2021 and have given it for repair to one of the apple reseller in Hyderabad called Aptronix. When I submitted my mobile the issue was with receiver, now they have want me to charge extra so they have come up with bottom speaker issue the resolution they provided was replacing the display. Since I am not an hardware expert i was ok with whatever they suggested it's their job to fix it. It's been 15+ days that I have submitted my phone they said to contact Apple support for direct updates and Apple support is also not in a position to tell me what exactly is the issue with my mobile. They are not providing any proper documentation. Dont know why just becyu can waste my warranty. It's so sad that my hard earned money is getting wasted and i am being played between these two companies. Can I atleast get my mobile back?