One of my regular cat sitting customers rang last week to book me for this bank holiday weekend. It was a bit last minute but she'd apparantly left me a message on the answerphone a week prior which I'd never got. Anyway I agreed to do the job and she requested the price so she could leave me a money out (some customers do this and some I leave a bill and they mail me the cheque). Anyhow I get to the job and when I saw the cheque I realised I'd only quoted her for one visit a day and not two so consequently I'd halved the pice. They are due back tomorrow so WWYD
a) leave a note apologising and explaining my mistake but letting them know for future reference (and also so they knew I'd been twice daily)
b) leave a note apologising and explaining my mistake and asking for them to mail me a cheque to cover the remainder (leaving an SAE)
c) something else
I'm kinda torn between a and b as I hate messing people about and wonder if I should just suck up it up or just stop making a big deal and leave a note to the tune of b?