A/C recharged

Went to get my A /C recharged. The guy tells me that it's holding pressure, but two valves are leaking. (What?). Tell's me my cabin filter is totally clogged. ( Just changed it two months ago, checked in parking lot after they were done, it wasn't ) $330 later, he tells me it is working fine now and is 32 degrees colder, but I won't notice today because it's not that warm out. I was watching these guys working on my car, when they were supposedly working, and I really don't think they did a thing. I would not take any vehicle here again, in fact I would like to take them to small claims court. They are committing fraud in my opinion. BEWARE!!!