I had one be honest the other day.
"Sorry Marc, we have been really pleased with your service over the years; but we cannot afford to spend the money on luxuries at the moment as i have been made redundant and i'm looking for work"
"no worries" i said.."hope all goes well looking for a new job, and thank you for your business over the years"
Her reply again was, "hopefully be in touch again soon to commence the service when all is settled and we have a clearer picture of our future"
I have had ones like
"again already.?..oh they dont look that dirty at the moment so skip it till next time"
and
"its going to rain at some point, so just leave it"
both occasions, I never went back.