The ones who tell you you have a problem with windows, and the ones who tell you you are owed compensation and require your bank details aren't 'proper jobs', they're scammers and don't deserve any polite responses. If I can have a bit of fun with them, on my terms, then at least I've got something out of it, rather than having my bank account emptied or my computer taken over remotely.
Likewise, unsolicited calls trying to sell me something shouldn't be surprised if they get a short, shirty response. If people knock at my door they get the same treatment.
Asking to be taken of their database, in many cases, is completely futile.