Business sells welding supplies. Particulary, compressed gases in cylinders. The cylinders are to be returned once the customer is through with them. Customer signs "contract" (which I have not seen) and credit is extended. Now, accounts are unpaid (which believe to be a civil matter)and cylinders are not returned. Is the failure to return the cylinders a theft of service?

It's a civil matter, breach of contract.

That is what I told them. I just wanted to see if anybody else agreed with me. Thanks.