My husband and live in a house that the owner verbally agreed to sell to us for $65000 and promised that while we were renting that if we did any upgrades the $65000 price wouldn’t change. Last month it was appraised for $109000 , an now the owner has retracted his verbal agreement and is not holding up his end of the verbal agreement. We have lived here for 12years. What can do to retain what we have invested , which is $21,497.92 .