my half acre pond was built in july this past summer. about 2 months after finished we had a small slip on the back side of dam the top of the dam developed a crack in the top of the dam the contractor said that maybe he had the dam to steep which may have caused the slide.he brought the backhoe up and pulled the dirt back to the top of dam and just covered the crack up with dirt. he debated about decreasing the slopeon the dam and then said lets wait till spring and see what happens.well we had alot of rain one weekend and the slip happened again this time causing major problems.and he is saying hes going to charge me to fix it. this guy is in his 70s and has a rep. for doing good work but being a crook for these kind of reasons but i have known him all my life and always liked him and defended him i never thought he would do this to me what should i do?