Under the rules of the Direct Debit Scheme, should any money be taken in error, then the customer’s bank or building society must, on request, make an immediate refund to the customer’s account.
I can’t see that an error has been made in this case as I presume that you have issued bills to him over the last few years giving him the instalments which will be taken from his bank account? And as long as you’ve taken the same amount as quoted on the bill then I don’t see that there is an error. Why has it taken him all this time to get in touch with you and not dispute this earlier? Why did he set up a DD on an account which he didn’t agree with?
I would have thought that he would have to put an appeal in against the classification of the property rather than claiming the money back through the indemnity scheme.