Send them an outrageously priced bill. Sometimes a book keeper at a giant company like that will just get those and pay them. The thing going for you, is you ACTUALLY Provided the service. They could look at it as cheaper than litigation and just pay you. Because if they've been running around with this giant picture on their boat it could be argued you've helped them bring in sales. Boom. Now you're asking for 5% of their profits. That $40k bill looks pretty nice about now.
Send them an outrageously priced bill. Sometimes a book keeper at a giant company like that will just get those and pay them. The thing going for you, is you ACTUALLY Provided the service. They could look at it as cheaper than litigation and just pay you. Because if they've been running around with this giant picture on their boat it could be argued you've helped them bring in sales. Boom. Now you're asking for 5% of their profits. That $40k bill looks pretty nice about now.