Passeggio's Plumbing and Heating Corp. review: Illegal billing

In September I had a clogged drain in my bathroom. I hired a plumbing company to unclog the drain. A pipe was damaged during the snaking, and my management company sent their plumbing company (Passeggio's Plumbing and Heating) in to fix the damage. On October 20th I was sent a bill by my management company for the work. The bill totaled $1575 and was lumped onto my monthly maintenance bill. When I asked to see itemized billing I was told it was not possible. I then directly called Passeggio's Plumbing to get an itemized bill but was told I they had been asked by my management company not to talk to me but would forward a bill to my management company who could then forward it to me. I received the bill which stated nothing other that $1200 for labour and $250 for a pipe. The Passeggio's claimed they had arrived at 8:30am and worked until 2:30pm. As I was in the apartment when the work was done I know that they did not arrive till 9:45am and left at 12:30pm. leaving 3 hours of illegal labour charges. When I pointed this out to my management company they told me they did not care and I was still required to pay the full bill they had sent me. When I mentioned that it was illegal to bill for hours not worked management told me that they would reach out to the Passeggio's to get more information about the bill. At this point I was told that the 3 extra hours was for travel time. Passeggio's is in Woodside NY and I live on the UES. Which means they are charging me $600 for an 8 mile drive (round trip). When I pointed this out to my management company I was told that they could no longer have any direct contact with me. I have heard nothing since from either Passeggio's or my management company and I desperately want to get this sorted out. Many thanks in advance for your help.