Before I retired, I owned and ran a small garage. I was very proud of my workmanship and more than 90% of my customers were 'recommends'.
One particular customer I remember had a problem with her rear brakes on her Fiesta. I replaced both leaking hydraulic cylinders and the brake shoes and charged her £103.
The very next day while in town her exhaust developed a blow and she called into a well known national free fit garage for a replacement.
She came back to me directly from leaving the said garage saying they would not let her take her car from their premises as the brakes were 'dangerous' even though she said they were fine. They charged her £200 for replacement parts and labour, and showed me the bill she had paid.
I examined her brakes and nothing had been done, (I always marked all the parts I fitted for later identification), and nothing had been changed or replaced.
I visited the free fit in question and challenged them directly and the manager admitted that they had in fact 'not' replaced any parts or done any work to her brakes.
She was refunded and I was paid compensation.
I did name the free fit above, but can't find the paperwork for it now so have deleted them, I do remember there was a lot of articles about them in the national press later for claiming and charging for work done when nothing was.
I will look for that paperwork (have to keep it for 10 years) and if I find it, I will come back and name them.