This is a business and you are still potentially 
a future customer. As my sister (who nearly 
always gets her way in these types of things) 
says: "EVERYTHING is negotiable."

This is when you pull out your receipts and tell 
them that first you expect full reimbursement
for the lost cels. If whoever you're talking to 
says that they can only give you $100, then you 
need to be talking to the next person up the 
chain. Don't forget, if you're talking a large 
enough amount of money here, you *can* take them 
to small claims court.

Many Sharp Smiles,
--Drac