ghostbuster

A contractor or mechanic who makes up, or exaggerates problems in order to upsell you on additional, or more expensive services.

The last HVAC guy who came in was a total ghostbuster. He was saying that my brand new furnace needed to be replaced, and he even wrote up a quote to replace the entire house's ductwork. All the furnace needed was a new igniter part. So I hired someone else who replaced the part for a fair rate.