Sorry, wrong question in the title but I can't think how else to express it. 4 years ago, we had a plumber do some work for us - major work - and we initially paid him every few weeks/months when he sent us a bill. Then, the work became more and more drawn out. If the truth be known, this plumber was completely incompetent and did not know what he was doing. The job, which should have taken a few months, stretched on into years, only being completed finally about a year ago, and not by this particular plumber but by his father (family business).
The final installment of the bill was disputed by my husband and I because there had been such a delay in its completion (2 winters without proper central heating) and such a catalogue of errors. The problem was actually finally resolved by my husband who read the boiler installation manual and realised what the plumber had done wrong. Months later, the plumber's father reluctantly listened to my dh, tried a different installation and hey presto, 3 years of problems gone in an instant!
At the time, relations were very frosty. We owed 2 bills, and I thought dh and plumber's father agreed between them that we would pay one of the 2 bills, but not the other because of all the disruption, incompetence, etc. Frankly, I got the impression the father was glad to have done with us and get out the door without us threatening to report him to trading standards and/or his professional body.
Then today, about 14 months after we last kicked these guys out the door had anything to do with them, I received a reminder for the unpaid invoice, which in itself dates back to work done about 3 years ago. Dh is away at the moment so I can't consult him, but I am in quite a state, fearing that we will have to meet this bill. It comes to over £2000! 