The contractor we used did not level the 4 to 6 inches of topsoil after seating. Because our property is sloped the grass is now almost 6 inches high, but we cannot get on it to mow it because you just sink in the mud. What do we do? We are in zone five, I believe, so frost will be coming soon. Do we wait until spring? What do we do with this long grass that we cannot get cut?