I have a plumber who is sending me an invoice for a service charge of 112$. We originally called the plumber told them our hot water heater had gone out no mention of a service quote was discussed. Within 40 min a plumber showed up, said "yes yo do need a hot water heater" I already had known this and that was the reason for the original call. The plumber did not have a hot water heater that day and told me it would be a couple days befor the work could be done. I had already found another plumber to do the job so told him no thankyou. No paperwork was ever signed and no payment was ever discussed. They are now invoiceing me for 112$ for something they never did. They did not quote a problem nor do any work. When I called regarding the invoice they told me they have a contract with a name scribbled which I never signed. They said if we dont pay they will recruit a 1.5% interest and put a mechanics lein on the house. What are my options?