USA PRO-VAC WHAT A SCAM!!! troy Michigan

i was calling around for prices on having my duct work cleaned. i was warned about companies quoting you one price and then swithing the price on you to a much higher one. this is a warning about Usa Pro-Vac. i had this company scheduled on a saturday. i took the entire day off because i wwanted to be home while the work was being done.my appointment was scheduled between 12 and 2. at 205 i tried calling the company. Nobody answered and nobody ever called back. after finally recalling them on monday, they told me that it woud now cost me alot more money to come to my house. its obvious to me that they try to pull this SCAM on other people. its hard to tell when calling these companies if they are a scam or not. this company is one of the companies scamming people beware of this i am warning everyone. DO NOT CAL USA PRO VAC!