I live in Mo. and on Feb 24, 2001 , I sold a GMC Van for $7,500, the party who bought the vehicle made a down payment of $4,000, and signed a contract to make Monthly installments of $250 dollars per mo. Thus far I have received one payment on 4-4-01 of $200 dollars. I was also informed that the buyers insurance has been cancelled 4-18-01. I sent a certified letter stating that i would need to see proof of insurance by 5-8-01 , or he would need to pay the oustanding balance of $3,200 dollars by that date . He has not made any attempt to speak to me written or verbal regarding this situation. What can I do to protect my Interests now?