No-Incall Audio on my new SGN

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Just had my SGN for 2 days now
problem is that i dont have any audio when calling
dont hear a thing and the other party says they dont hear anything from me as well
even if i hit speaker mode
recording sound has no problem though
playing music through the speaker has no problem as well

is there a fix for this or am i doomed to have it returned?

ive already upgraded it to the latest firmware OTA
and already did a factory reset.
hit the in-call volume to the max levels
still nothing...

if i use a rom like ICS
will the problem be fixed?

If you are on the stock firmware then something with the phone. If you bought it used, I would use Odin and flash an official OEM rom. If the problem still exists, look for a methods to get your money back.

would that be the only solution?
what if i flashed to ICS?