audiovox smt5600 stuck in headset profile

My audiovox smt5600 stuck in headset profile. This affects my ability
to change profiles, ring volume etc.. i can use the phone normally
without the headset, and also use it with my bluetooth headset.

I have tried plugging in the headset and also another headset, and
removing it; also removed the battery and sim card for a few minutes
and restarted it, no effect.

any advice on solving this? I have returned this phone many times for
bigger problems and would like to avoid another exchange.
any advice on solving this?