Please help me write a persuasive letter for this situation attached

in this chapter. 11. Last fall you began a winter snow-shovelling service. You offered customers a choice of a fixed cost of $300 to cover all snow removal throughout the winter or an hourly rate of $15. You hired students to do the clearing, and you provided equipment and handled the sales and paperwork. Jennifer Harvey agreed to the fixed cost of $300 and paid $50 in advance. The winter had an unusually light snowfall and your employees were only required to spend a total of 10 hours at the Harvey property. Mrs. Harvey has written to you and enclosed a cheque for $150, saying that this will cover the work done. You don't agree. Since Mrs. Harvey is out of the house a lot and doesn't return your calls, write her a letter asking for the account balance in a way that will not antagonize her. (Remember that the Harveys' neighbours are customers and potential customers.) narating from your house. You