Tom,
exactly same happened to me with lad that worked for me for almost 15 years,
letting me down,telling me when he was working,first sign of rain going home , all the usual.
We started out as mates,so obviously i let alot go, and then we parted , after a few months he did to me the same as you are experiancing.
i phoned him up although i wish i hadnt,because w-----s like him cant see anything wrong , so i pulled him up the other month & to put it in simple terms, i told him that if he attempted to undercut,tell customers crap then he wouldnt be cleaning windows again.
I didnt want it to come to this as i tried asking him to stop messing with the work i bought years ago, although if my customers want to pay less to him,they werent worth keeping in the firstplace.
IT SERIOUSLY ANNOYS ME , all these muppets who do this kind of thing , THEY DESERVE EVERYTHING THEY GET INCLUDING THE LAD WHO THOUGHT HE WAS BEING CLEVER WITH ME .
Chris.