people like that p*ss me off
Me too!
If it's a good account, speak to the guy, face to face and explain yourself.
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That aside, in every invoice I have to post, I always give a reference to our 'contract'.
My invoices start off with something like:
'Reference:
A. Meeting with X Manager and Tosh dated 7th April 2004.
In accordance with Reference A, the exterior windows of 'your property' were cleaned on the 24th August 2006. It is requested that you send a cheque for the sum of XXXX made payable to XXXX etc'
I think it's good to remind your commercial customers of their original agreement.
But at the end of the day, there's not much you can do.
He's obviously after some 'Brownie Points' for saving on the cleaning budget, and if it's a good job, he'll easily get a replacement for you.