I agree that the fence could be your fault, make sure you are doing one or two passes around the edge of the property to keep the clippings off the grass.
The grass not growing is 100% the clients fault assuming that you seeded, fertilizer, put down penn mulch or straw, and told them that they needed to water every morning before noon for two weeks and then could go to every other morning for another two weeks.
There is an Old Blue Chair for each and every one of us, we just have to find it.
2015 Ram 3500 6.4l hemi 4x4
BOSS 8'2" VXT
Hustler X-one 60" 3 bin bagger
Toro Proline 36" wb w/t-bar controls
Walker S14 36"
Shindaiwa T242, Echo trimmers, chainsaws, pole hedge trimmer, pole saw, hedge trimmer
Shindaiwa 633 and Echo 755