Short version... backed into a scooter that was parked behind me reversing out of parking space (parked right up my arse didn't see it in mirrors)
Made contact but immediately stopped so it wasn't pushed over. There is a tiny amount of paint rubbed off, literally the size of a raisin.
Exchanged numbers, (the rider came out of shop I'd just left) they said they'd take it straight to the shop for quote and I said fine let me know...
Anyway, they called I spoke to the mechanic who told me price, I said fine let me get another quote for peace of mind etc.
Other guy said her quote was reasonable so I agreed to call round to her mechanic and pay him.
Called round, manager out, other guy said call back later so texted to say I'd tried to pay as promised but couldn't and would call round later.....
Then the fun starts
Scooter owner calls straight back to say they've changed their mind, don't want the paint touched up, want the entire panel replacing and it'll cost twice as much and they want cash delivered to them not the shop.
I said no, original quote to shop as I want a receipt, loads of nonsense in between and eventually they back down and go with original. I say I'll drop it up to shop but no they want it delivered to their house in cash 
I say no and want receipt. They then say they've spoken to the shop and if I leave the money there they'll take some of it off the fulll amount if she goes to collect it so clearly she just wants the money and not do the repair
I call the shop to verify, they say she's not called and they're happy to hold an envelope of cash for them and give me a receipt and won't take any of it!
I don't want to hand cash over to some randomer at their door as then I'm worried I get a call tomorrow saying that they want more, especially after they've already tried to change the goal posts more than once already, and I'd not have a leg to stand on as their way there's no witnesses or reciepts to prove money has exchanged hands?
Now they're being an arse though and saying they've told the shop not to accept anything from me and if I don't deliver cash to their house thy want to go through insurance
Once again, the patch of paint rubbed off is smaller than my little finger nail.....
Would I be totally unreasonable to just drop the cash round to the shop and text to say collect it or bog off? Or just suck up the excess and increase in premium next year to get them off my back?