Here's my personal opinion. 

If you want to have the cel restored, do it. If 
that can recapture a little of the joy of owning 
it. Do it. It was your money, to be spent as you 
choose. If you feel that the cel will not leave 
your possession again. Do it.

Bottom line, you probably won't be able to recoup 
what you paid at this point. You may actually 
even increase the value of the cel by having it 
restored, but make sure that if you do sell it, 
you fully disclose what has been done to it and 
explain why.

As far as the contacting the seller... I would 
let them know that you're not happy with them. I 
would also let them know that you will make 
readily available the information on their 
business ethics to anyone that inquires unless 
they make some effort to work with you or at the 
very least apologize.

They obviously knew that the cel was damaged, and 
they chose not to fill you in on that fact before 
they took your money. Makes you wonder if they've 
done this to anyone else.

Anyway, just go with your instincts. It's your 
cel, do what makes you happy.

--Jennifer