of course. What kind of image does a company that seriously considers forcing a customer to pay $85K receive? nothing positive, I am sure. I know that ATT wireless's policy is to suggest the best plan that you have for the person ($80 laptop connect) and then credit the rest.
I have, however, seen cingular force a customer to pay $7K bill. I tried to help her but it was to far out of the range we should be crediting.