OK so. You have left it with the PRTB, but on their own admission, they are unable to deal with the matter as the landlord resides outside the country. Did you ever think that it just might be convenient for the Agent and Landlord to tell you that they have fallen out !! If his brother is solicitor in Ireland, I assume you must know here he operates from. Have you considered dropping him a line outlining the facts and telling him of you intentions to take his brother to Court (he doesn't know what money you have to employ a solicitor). If a judgement is posted against the landlord at his brother's address should move matters on. Furthermore send / copy the letterto the landlord in Canada and place the matter with a collection agent in the City where he is living. This is a matter of principle rather than the money