i have been issued with summons to pay for an acc

<br> I have been summoned on an amount that am not aware of I do pay my levies as signed a debit order with my bank . <br> as per the letter of demand, Am being informed there's amount outstanding.<br> <br> They want me sing and Urgently provide them with the signed acknowledgment of debt.<br> <br> When I have requested with the proof and they are not sending and demanding payment. <br> <br> \Should we not receive same as stated in the letter of demand