uncompleted payment for original deposit

Collection letter series— Reminder, Inquiry, and Demand: You are the owner of a general contracting business that undertook extensive renovations on a property owned by Arnold Levitt. Work valued at $17,000 was completed on schedule three months ago. The property subsequently passed inspection. Because Mr. Levitt has always paid you on time for all previous contracts, you are somewhat surprised that all but the original $1,700 deposit remains unpaid. There is some urgency to your request for payment because you must settle your own accounts with electrical and plumbing subcontractors who worked for you on the project. Mr. Levitt travels frequently, so you have been unable to reach him by phone.