The gaul of some people!

I just received a call form a man who I beleive was prepared to get nasty with me over a payment to my accountant... He started the conversation with:

"This is so & so form blah, blah accounting, I left a message for you 10days ago, (said in a very annoyed tone) I don't know if you received it."

Me: "No I didn't receive it & the invoice you're chasing has been paid. Originally I was invoiced the wrong amount then I was re invoiced at the amount I was quoted. I then came into your office & paid the amount owing by credit card."

Him: "how long ago would this have been?" sounding a little less annoyed.

Me: "At least a month ago".

Him: sounding kinda appoligetic "Sometimes with credit card payments its a little harder to track. Thank-you very much for your time".