I have iPhone 6s, after upgrading it to IOS 11, it...

I have iPhone 6s, after upgrading it to IOS 11, it started to be extremely slow, unresponsive, and turn off by its own, and suddenly photo album got mixed up. I made an appointment to see a technician , I went there and he said your iphone warranty has expired so you need to pay $250 to swap it. It s not my f*** fault, it s your stupid iOS 11 update is the one f**** up my phone. Seriously Apple is doing nothing good at all, I just don t trust them no more. I m seriously considering switching to Samsung or google.