Rogue traders based in Bradford are the first to be named and shamed by West Yorkshire Trading Standards as part of a new clampdown.

Quality Plastics has caused misery for at least eight families in Bradford, mostly elderly people who tend to be more trusting of cold callers, according to trading standards officers.

Quality Plastics workers turn up on the doorstep, offering to repair UPVC fascias and gutterings.

A spokesman said: "Quality Plastics are itinerant traders who rely on cold calling to generate trade at the doorstep. Work carried out is of a poor standard and sometimes not required in the first place.

"In response to complaints, officers from Trading Standards have contacted the firm and found them aggressive and unco-operative. A representative of Quality Plastics blatantly commented that he does not care that he has ripped off consumers and he was not prepared to discuss the complaints."

Invoices and guarantees given to customers are false and do not have an address printed on them. A phone number connected frustrated customers to a caravan site in Bradford.

One representative from the company gave the name of John Wall, which officers believe could be an alias.

One Bradford woman, who preferred not to be named, said that her 69-year-old father, who lives in Idle, was targeted by the company.

She said: "They knocked on the door about five months ago and offered to do his fascias and guttering for £750. A previous quote had been £2,000 so he agreed. They had a van with Quality Plastics written on and their receipt looked realistic."

Two months later, the guttering began leaking. But when the customer rang up to complain and get it repaired, Quality Plastics "gave him loads of abuse".

West Yorkshire Trading Standards spokesman Graham Hebblethwaite said: "Most of the complaints we have had about this company are in the Bradford area and tend to be from the elderly. Our advice is: don't have anything to do with traders who either put a card through the door, just give mobile numbers or turn up on your doorstep."

The Telegraph & Argus tried to contact the firm, but there was no response.