Marked as Spam Telemarketer

Some guy called asking about cleaning airconditioners. Wasn't clear about who he was working for. Decided to dictate to me that as per regulation (didn't specify which regulation) I should clean my air conditioner. Looks to be reading from a script, didn't even ask if I had an air conditioner in the first place. After a lengthy one-sided conversation (obvious again reading from a script), he decides to ask if I was the one to talk about cleaning my 'air conditioner'. I told him you should have asked first if I had one. When told I don't have one, got upset that I didn't tell him at the beginning. Unsolicited call, I didnt asked to be called about air-conditioning. Piss off!