Hi
I would advise your sister to contact her local Trading Standards Officer.They are usually listed in the telephone directory under your local Council.They would also be able to tell your sister if it was worthwhile involving the police.
Our local radio station has a brilliant consumer programme which aims to 'solve' listener's problems.You could listen to it on the internet at www.bbc.co.uk/radiowm.It is presented by Ed Doolan and is on Monday to Friday 10am -1pm.It is Birmingham based but people ring him with their worries from all over the country and often from abroad.If you think he can help, his telephone number 08453009956.I would highly recommend him.
GOOD LUCK!



