He has paid 4 amounts into my bank account, he has said today that he is not going to pay me anything else just because he isn't going to pay anything else. Not that he disputes the amount, or has no funds, just because he doesn't want to pay anything more.
I have a list of things I have purchased on his behalf, which has been sent to him via e-mail. I have text messages where he has agreed to repay one hundred pounds per month, until it is repaid in full. The only problem I have is that his reply to repay one hundred pounds a month is not replying on my original e-mail detailing the debt.