How do you make a letter to a client for termination of services of sites due to delay in payment?

If it has gotten to the point where you are ready to end the relationship, the letter would be firmly Worded. You also must take into consideration the terms of your agreement or contract. Dear Sir: We have repeatedly attempted to collect the outstanding and past due balance on your account. Yet, we have received no payments, as promised, in over 90 days. Therefore, in accordance with the terms of our agreement, your company is in default and we will terminate all services 5 business days from the date of this letter. Our final invoice is enclosed. Furthermore, we demand payment in full for all outstanding invoices, including our final invoice, within 10 days of the date of this letter. If your payment is not received, we will immediately persue all legal channels available, including civil action through the courts. Please be advised that our contract clearly states that you are responsible for all costs of collection including legal fees and court costs. Please feel free to contact me if you have any questions. Sincerely,