RHINO LININGS OF POCATELLO

We were quoted a price for 2 truck beds, took the beds in to be sprayed.  When we picked up the beds, they had almost doubled the quote we'd been given.  The reason: a customer had not paid his bill and so we were to pay it and we could collect from the customer!  As business owners, we've never ran into this before.  We did not allow them to bully us into paying the additional charges given to us.  One of these beds was for an insurance claim  - so OUR customer was the insurance company.  The other bed was for OUR business use.  The above 'non' paying customer had nothing to do with us.
I know this sounds bazaar, but this was their thinking!   We actually had to threaten to use a neighboring business' forklift to load our truck beds as they refused to load them until they were paid.  We have no problem paying our own bills, but refuse to pay for others as we do not have that kind of money.  We will not do business with them again, as there are others in the area that do similar types of linings.