IPhone 5S GSM no sound during calls

Dear all,
I have been having this issue for quite a while now and nothing seems to be working:
95% of the times when I try to answer or place a call, it will connect, but I would not hear anything and I also will not be heard. The phone app itself is also very sluggish (it freezes for 5-7 seconds). It is the same if I try placing a call using headphones with a built-in microphone. Turning the speaker on won't help either.
When the call does go through with sound, the quality is not great, but still acceptable. Once it does, I am able to talk even for hours, and then it is back to square one.
Suspecting it might be a carrier/network issue, I requested a sim unlock, which they did. If I put a different sim card in it, I can place or receive a call, but the problem with sound is still there.
I tried all the steps I could think of, including a soft reset, a hard reset with and without backup from before the problem occurred, a complete wipe out from the DFU mode (with new firmware), resetting network settings multiple times, changing the sim card. I tried also turning the location services off, turning the noise reduction off etc. It happened weeks after I updated to 8.1.3 and is still there after I upgraded to 8.2, so probably it is not upgrade-related.
Facetime, Facetime Audio, Skype, Viber, regular text messages, iMessages and every other app that uses sounds/mic/headset/speakers work just fine both with and without headphones, both on Wi-Fi and on cellular data.
The phone has never been jailbroken, never had water damage, has never gotten any major falls or other damage. There are no Apple Stores where I live, unfortunately.
Any suggestions would be greatly appreciated
Thanks in advance!
Cheers to all,
chasingwind

Hi, chasingwind.  
Thank you for visiting Apple Support Communities. 
I understand that you are unable to hear via the receiver during a call.  I see you have tried some troubleshooting steps with the issue persisting.  There are just a couple more steps that I would recommend going through in the article below.  
If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone
http://support.apple.com/en-us/HT203800
If the issue persists, see the section labeled Get more help.
-Jason H.  

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