OnePlus India — Inconvenience regarding service

I have a oneplus 9. Bought it in april 2022 and since then I am facing an issue with the slide button to put the phone on ring, vibration and silent. It often gets stuck, then I have push it really hard. So, it got stuck just as everytime but it's not moving now, I tried alot. So I went to customer care centre. First of all, the nearest centre is half an hour away from my place and when I reached there, there was a waiting for 2 hours and on the top of that I had to deliver my phone. This is heights of inconvenience. It is unacceptable and I am not going to recommend oneplus to anyone. I also have been facing issues like not receiving gmail notifications even after enabling all notification settings. I called customer care, they told me to wait then cut the call.
Do something about it or else I'll start writing bad reviews everywhere.