We have had a few customers want to cancel because they are not happy with the results and that first phone call is the first we have heard about it. When we have looked at the lawns, there's nothing wrong. They have the greenest lawn on the street. We have thought about sending a letter letting our customers know if they are not satisfied with the results or have any questions concerning their lawn, we would be more than happy to look at their lawn and make suggestions. How can you help a lawn (or customer) when you don't know about it???? Any suggestions??