Mic and Receiver not functioning properly - lots of issues

Hi

Device is an iPhone 7 running iOS 11.1.

Things started when calls would all of a sudden start to break up, then whenever I try to make a call or receive one the call screen would freeze up and the other party doesn’t hear anything.

I need to close the call screen like you would close an app, so now I can’t make a call.

I’ve noticed that basically any app or service that uses the mic or receiver isn’t working properly:

• Siri – doesn’t respond to voice
• Dictating on the keyboard – fails as well
• Listening to anything on the receiver doesn’t work – for example a voice message on WhatsApp
• Voice Memo app – gets stuck as well.
• And so on…..
• The speaker works as usual though.

I took it to a lab and he said there’s a notorious issue with the iPhone 7’s audio chip and it’s probably it

What do you think?