Hi, welcome to the site. My name is Max and I will help you with your question.
This is not likely to be a criminal offence kind of matter. However, they should have finished the work as promised. You could force them to do that, via the Court, but in all honesty, I would suggest you simply contact another supplier of this type of thing, and ask them to do the job instead.
They will cancel the previous job and proceed with a new one for you. It all comes under one government scheme you see.
Do you want me to tell you about any specific thing concerning this?
I dont know why I botherd . thats £40 for nothing.
Why is it £40 for nothing?
I want to help you.
I just need to understand whether you want practical information, or legal information about what to do via the courts?