The school at the centre of a row that led to a fundraising company being expelled from the Fundraising Standards Board has still not received the money it is owed.
Numerous attempts by a school staff member and the FRSB's compliance manager had failed to produce the money.
Demetrios Bradshaw, director of Sports 4 All, told Third Sector on 20 May that he had sent payment to the school. But when the FRSB contacted the school yesterday, it said it had still not received the money.
Alistair McLean, chief executive of the FRSB, said he was "thoroughly disgusted that someone who promised to reimburse the school had failed to do so".
McLean said it would support the school in pursuing the money "through whatever channel they choose", and it would update the Department for Education, the charity the Youth Sport Trust and Surrey Trading Standards, which it had previously informed about the case.
Bradshaw told Third Sector he did send the payment three weeks ago and that he would try to sort the situation out next Monday morning, once he was back from Northern Ireland.
"I have sent it," he said. "I don't know what's going on. I'm going to ask for bank transfer details now because this is the second time they say they haven't received a cheque."