My Nikon MB-D80 is stuck on my camera and won't come off?

To i resived a Nikon MB-D80 from amazon…
it was all packed no beaks or anything its full is a Nikon
so i put it on my Nikon D90 and fantastic it works great.
i must of took 50 shots in about 2 hours then whent to remove the battery and the pin that on the lock that opens the battery door fell out, problem.
so whent to remove the hole Grip… Won't come off
the wheel is really stiff. Won't spin… Then spins freelly and goes stiff then ships freelly. But won't come off?
i only got it today? What do i do?
please help i don't won't to have to send the hole thing off and not have it for mouths and the closest Nikon reper center it 68miles away about 2 hours drive in london!

what do i do?

Well first of all contact Amazon. The easiest is to chat with them online:
https://www.amazon.com/...&skip=true

They're really helpful and can give you advice on what to do and most likely they'll go ahead and refund you or send you a replacement for the battery grip. Then you want to contact Nikon since the battery grip was their product and it's apparently damaged your camera. They might be able to send you a loaner camera or something while yours is being sent off if it was truly their fault and not yours.

Hmm

Once I put my MB-200D on my D200, it never came off… Ever really. I just recharge the two batteries from time to time and that is it.

Why your MB-80D is a problem may mean that it came to you damaged in some way. If it is a new product, then Nikon's one year warranty will repair it for you. If it was purchased used, once you get it off the camera, you need to return it to the seller.