back in march: i got a new client. i recieved payment for a prepaid fert program. i only did one app to this point. she wants a row of trees along a fenceline. heavy shade. i reccomend hemlocks. splendid, we are a go. i bring 3 yds of topsoil to raise the height a bit. plan on bringing the trees next week when i have time. customer emails me saying they changed thier mind, hold off on the trees. i tell them they owe me for the topsoil. they say that they don't want the soil there, if they arent getting the trees. the soil is already there. they say they arent paying for it, i can come and take it back if i want. what do you do?