Knock Knock (8 weekly custy, who was out last time, in a row of three semi's I've done for the last year or so.)
Me: "Hi Mr. B; it's the window cleaner! Before I start, just a reminder you were out last time so it's two lots to pay this time is that ok?"
Old Mr. B: "I'm not paying you for last time and I'm not paying this time - you didn't do the backs."
Me: (laughing, slightly embarrassed) "Yes I did, I did them by accessing from your next door neighbour's ... "
Mr. B "No you didn't, you couldn't've got over the fence."
Me: "I did Mr. B, it's only 4 ft high and there's a gap by the greenhouse."
Mr. B "You couldn't have got to my bathroom window."
Me: (getting a bit exasperated) "My son-in-law did that one from the front."
Mr. B "I don't believe you, my sons told me you couldn't have."
Me: "We did, we use a pole to get to it."
Mr. B (Looking incredulous like I'm having him over.) "No you don't!"
Me: "Are you calling me a liar?" (I know, I know

)
Mr. B "Yes!" (Slams door.)
So seething away I clean the neighbours and fume and think I'm gonna look great trying to get this old fella to pay; anyway DtM says send him a letter threatening legal action. So I say what for £12, waste of time. DtM says well just tell him you will, you don't have to bother do you?
Thinks. I go back and knock the door.
Mr. B "What?"
Me: "Can I have your postcode please? Saves me looking it up?"
Mr. B "Why?"
Me: "So I can get a legal letter sent to get the money you owe me."
Mr B "Come inside, come inside and talk."
So we have a repeat of the conversation without it ending in him calling me a liar but saying I want my windows cleaned so I'll give you £20 for last time and this time and call it square.
I say no, (I'm not doing his windows if wild horses dragged me there.) just pay me the £12 you owe and we'll call it quits.
So he pays me the £12 and I say I hope you treat your next window cleaner better than the one you've just lost, good day! (If I'd had a handbag I could have flounced off like Tosh!)
Hey ho!