Help S4 - Phone call sound disabled. Works in vibr ect

Hey guys, as title says my s4 recently developed a problem where both audio and microphone are disabled ( speaker, headset, earpiece.. all audio input and outputs ) during phone calls using the default 'phone' app , but works fine using vibr , Skype ect. There is no other issue with the sound everything works fine.

I have tried....
-a factory reset
-certain apps that divert sound to one output
-plugging and unplugging a headset
-contacting my service provider ... for no reason as its the phone that's at fault.


I have run out of options and am not tech savy with phones / android
:( any help would be greatly appreciated.

thanks in advance!!
 
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