I remember your woes!
I think I would firstly consider whether I would just ignore him (this is what he did to you) - would that suceed?
If not, I would not contact him - I would wait until he contacted me again.
Mainly because I would make him do the chasing he made you do.
I would be even tempered with him and state clearly:
Well, the problem is you didn't finish the job.
Are you saying that what you've done amounts to more than what you've been paid?
Because you not only didn't do the job but your failure to do so cost me much more money in getting people to finsish the job.
Are you Mr Builder prepared to compensate me for that extra cost?
I didn't think so!
Well, unless you are - I don't see how we can go forward.
You can't diasappear and leave me in the lurch - I tried to contact you repeatedly - you were gone - fecked off.
You cost me a lot of money. I've been decent and not chased you for that.
If you are going to play silly buggers - get togeter an itemised receipt - an actual real/retail/trade suppliers receipt for every item you claim to have purchased + labour
And when I've got that - I'll send you the bill for the extra money I had to pay because you vanished.
I'm a wuss but I'd be so furious - I think I couldn't let this go.