For long and tedious reasons, I have ended up owing money to a debt collections agency. I sent cash via next day signed for special delivery. They claimed at first not to have got my letter. I sent proof that it had been recieved and signed for. Yesterday I got a text saying that they had got my letter but it had been lost in their office so could I "cancel the cheque and send another" I hadn't told them I sent cash. What should I do? I didn't send a cheque because it states clearly on their documentation that they don't accept them. I sent cash because I thought it would be the quickest and cheapest way of getting the money to them and I thought it would be safe sending it special delivery. It didn't cross my mind that they would lose it. Any ideas, anyone?