I have recently completed a job for a landlord, who has now decided to not pay me. I did not provide a written quotation but agreed verbally on the price. Having done the job the landlord has indicated that certain aspects have not been completed, and I have stated this wasn't in with the price. I have already completed additional plumbing work to what i quoted for and not been paid for that either. Can anyone adivse what my rights by law are. I have invoiced them with the amount due, but landlord won't even return my calls. Can i charge interest on the amount due on a daily or weekly basis. What is the best way to resolve this matter before going to a debt collecting agency. Any comments, past experience on this would be most grateful