I am a Construction contractor and I have a customer who has signed a contract presented to him for work he requested. My contracts state that I receive a specified (per contract) amount of money up front for materials with the balance for labor to be paid immediately upon completion. I have been working for this man 5 years and my contracts have always been presented the same way. This time however, the customer signs the contract but will not pay the $5,700 up front for materials. I am a licensed and insured contractor with a very good reputation. This customer does owe me $800.00 at this time for services rendered. Am I able to get what is owed and sue for breech of contract? How would you proceed?