Well I did mulch for a customer last week. The beds were prepared first, with weeding and weed killer. Today the customer complains that there are small weeds coming through the mulch. Well I said I did my best that I could. And the rest is nature. I never said that I could back everything I do to prevent weeds 100%. The customer says how dare you blame nature. She says that I need to weed again. I said that you refused to put down the paper, which actually I had seen results with in other jobs. What do you guys do in this sitution.?