Our last stove broke and our landlord had to replace it.  We got one from GE Hotpoint and it seems like an OK stove.  It's a gas model.  We have had it for a few months now but haven't been able to cook in the oven just on the top range.  When we first got the unit it let off smoke and a very odd smell.  I read the manual and called GE and they said it was normal and it should stop after a few hours of usage. The cause was the binding agent used in the fiberglass insulation that surrounds the stove.  IT burns off or something.  The woman recommended we run the stove on 500F or so for a while to just get it over with. We tried this and at first the smell was really bad and it's getting better.  But it's been months.  We have turned it on for about 6-10 5+ hour runs at around 450-500F.  We had to limit ourselves due to wind direction and that somebody is home only 2 times during the week when we can stay with it.  Anyway it's been some months now we still have it.  We just had the over on 400, 450 and now 500F for about 5 hours.  There's no smoke any more but I can still smell it.  I'm afriad to use it to cook with.  Is this really normal and how long does it take to go away for those of you who have had new stoves. 
At this point, I would try to invoke the manufacturer's warranty. You've already tried patiently going through the burn-in period they recommended.   If they told you the smell would be gone by now, but it's still there, then there could be something else going on that really does need attention. The gas burner could be malfunctioning, possibly releasing dangerous levels of carbon monoxide.  You might also contact your local gas utility company and ask them about it. They'll probably come to your home at no charge to test it. If the gas company says there's a problem, then you'll be able to put more pressure on GE to make it right. 