Your right to bin them Andy.
I'm just waiting for the same to happen to me. Phone call last week to come and price a big house complete with a 4 bed holiday home next to it.
It wasn't until I priced it she told me her previous W/C only charged her 70p per window and all the frames included, I told her my price was £1 per window and not in so many words take it or leave it :
She said she had another 2 W/C's coming along to price that day :
and would be intouch (Yer right) she then began to tell me how to gain access to the windows above her conservatory and were I had to walk
No way I said, I use wfp and no need to walk on any roof? she looked Startled at me and said..... 'Well that means my bottom windows will get wet with dirty water won't they?'......YES! I replied but I'll clean the bottom ones last.....NO NO NO she said, I only wont the top ones done, as to have it all done will cost me a fortune :
The problem I faced was its right by a lot more I do, and this one alone doing tops only is worth £40
She phoned me yesterday saying I could start today :
I told her I could start when I do the rest in that area and not before, So I can see I will be having problems with this one. and the lid of the bin is already open for her, I'm just waiting for her to jump in.