The bank is not responsible for (a) the use of funds withdrawn from the account or (b) determining whether a person is entitled to obtain funds that have been ordered or ordered by the contractor. To the extent that the bank, after receiving written instructions from the duly authorised representative of the customer or the contractor with the bank, shows due diligence, the bank shall act in this regard and shall not make liable to any party or third party for any action taken or not taken in accordance with such written instructions, including, but not limited to, instructions for electronic transmission; File, mail or other electronic instructions or transactions, including automated clearing house entry, or for breach of a guarantee or guarantee by the customer or contractor, as the case may be. . . .