b)If the ECA Agent pays an amount to another Party and it proves to be the case that the ECA Agent had not actually received that amount, then the Party to whom that amount (or the proceeds of any related exchange contract) was paid by the ECA Agent shall on demand refund the same to the ECA Agent together with interest on that amount from the date of payment to the date of receipt by the ECA Agent, calculated by the ECA Agent to reflect its cost of funds.