So i did a mulch install 3 days ago for a woman id never worked for before. She has us spread 4 yards in what i told her would surely need 5. When the 4 yards was gone i had to go to the landscape yard and get the extra yard for her. She also had us rake her grass to remove some thatch. I told her it needed a full on power raking but she told me no she wanted it raked by hand. So we raked the entire yard with a garden rake and pulled up about 1 full yard waste bag full (it was a small yard). Three days later she calls me complaining about the job saying there is still dead grass in the yard and i say of course there is there will always be you should have had it power raked for much better results. She begins to tell me that i dont know what im talking about and i better send her back everything i charged to rake her yard or she would stop payment on the check. How would you guys handle this?? I have her check..she wants $100 back, should i just deposit the check or should i send her back what she wants and move on?