On behalf of a friend who has had some work carried out by a registered workman ,the work was shoddy and unfinished a case of a cowboy builder , Having paid the majority of the monies the builder left without finishing the work ,he is insisting with bullying tactics that the balance of the devis is paid even sending two police officers to the house , \Where can they go to get some advice , and who would deal with a situation like this , Thank you in advance for any help