Arthur:
Don't take it to heart.
This kind of @ssho!e customer is no doubt such a prat that he has no friends left to tell how unfair you have been.
I have had dozens of similar letters, emails, calls, even a solicitor's letter from one person who we declined to sell a caravan to (because we did not want him as a customer, no other reason, and no racial issue)
They all say "legal advisor" (bloke down the pub) or "solicitor" (bloke down the pub who wears a tie or even "barrister" (bloke down the pub in suit and tie)
I laughed at the one who said "barrister" as anyone who has watched "Kavanagh QC" knows that the public do not instruct barristers, solicitors instruct barristers.........
The solicitor in the above case was quite persistent (the bloke's brother in law) but even he pi$$ed off eventually.
Threats that "I will tell trading standards" or "solicitor" or even "Watchdog" have all been that.... just threats.
I have a waiting list of people wanting to spend £40,000 plus on a new caravan on my park, despite all these unhappy clients threatening to ruin my reputation
An advert is legally an "invitation to treat"... in other words it says that "if you offer me £9 an hour, I might be prepared to accept that fee for my services"
NO CONTRACT EXISTS UNLESS HE HAS PAID YOU AND YOU HAVE ACCEPTED HIS MONEY
Tell the prat to shove his cleaning where the sun doesn't shine, and UNDER NO ACCOUNT do any work for him, as then a contract could be formed.
Word of mouth from a prat like this.... don't worry, he probably spreads rubbish about all sorts of businesses to those people bored enough (and stupid enough) to listen.
One prat talking out of his @rse, versus all your happy customers.....
No contest... you keep your reputation.
Don't let it get to you, there's people like him everywhere. Sleep soundly.
All the best, Andrew.