Hmm...

I've had a similiar problem when I updated my 3310 to 3315 v5.57... But other then not hearing anyone, the phone would drop call if not completely turn off the phone.

What I did? Reflashed it again with a new flash to make sure it wasn't the flash problem, Update Faid, factory default (UI, Phone Settings) and set the IMEI to the original IMEI under the battery...

It worked fine after that. Hope any of this helps

Regards,
-Dave

P.S. Ohh yeah, if the battery does not charge, try charging it on another phone first