We sold dm's house via agents 18mths ago a previous agency is now claiming commission costs (via a third party collection firm) even though at the time they were well aware we had appointed a different agent who went on to secure the sale and didn't mention anything about commisson fees payable if another agent secures the sale. It doesn't seem fair when they had plenty sole agency time to sell the property. Can they do this? I can't find t&c's at the moment to check but it seems a bit strange.