YOUR ADDRESS (date) (name street city county post code) REFERENCE: Dear ____ (name): We have contacted you several times by letter and phone and have discussed arrangements for the payment of your account. The following items are still overdue: No. Date Amount No. Date Amount No. Date Amount So far we have not received any sign of your cooperation. Therefore, we must insist on immediate payment. Please use the post paid envelope that is enclosed for your convenience. Yours faithfully, (name) (title) Enclosure