Hi Tony.
I have to agree with slash and colt. (don't go back)
I use to think about writing letters and have left notes to people.
It only makes a bad situation worse.
Just walk away.
Done this to a couple of messers, 1 dumped a year ago another 3 months ago.
both custy's back on board, just explained the problem to them one couldn't post a cheque; even though she lived 50 yards from a post box :

(now she is internet transfer).
Other one gave me a couple of not today's (so told her politely, i can't have that)
So walk away; once they've been missed out they usually have to know why and tell them as politely as possible.
some will go off in a huff and slam their doors; a few will realise the error of their ways.
As someone said on here always leave the door open; it's upto the cust to slam it shut.
But take comfort in the fact that they will need their windows cleaned before you need their money
