Why is my microphone not working only when making calls ?

Hello all,
I have a problem with my Lenovo S930 Smartphone to fix urgently.
(MTK6582 Quad Core 1.3GHz Android 4.2)
The microphone is not working when making calls (so people don't hear me talking.)
But strangely the microphone is working perfectly when recording videos.
It seems to me like a application problem but I am no android specialist
Where can I get help ? What can I do ?
thanks in advance for your support
Jean-Francois

Go to settings>backup & reset...there should be a factory reset option.
*Note: Settings names and location are firmware build number dependent.
**Backup anything important first.
Hope this helps.
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