Some months ago I had my guys dig and prep a walkway for flagstone. 26 x 4 feet. Laid and tamped 4" of 3/4" and an inch of sand on top. We measured her samples and brought the bed up an inch below the steps and sidewalk. Her bill for the labor and material was $775. She inspected and was happy with the job and paid us promptly. She called me later that week and wanted me to raise the levels on either end. We did that gratis. She called me a few weeks later stating that another guy had come in and told her we should of built berms adjacent to the bed. I offered to remedy this for her but she declined. After 4 months I get the following email; "Since so much time has passed, you must have concluded I opted to have another crew complete the flagsone walkway at my home. I appreciate that you said you would return, but upon reflection, I decided that having had two times of working on it and neither one being the proper height, and being borderless, I simply went with someone else whose procedure suited me more appropriately. This note is to say that he put in more gravel, used your sand, added a border, laid the flagstone, and finished with Gator Dust for a fee of $700 which was less than your $775 for a borderless sand and gravel. I mention this in case you might want to refund a portion of the funds I paid to you for the work your crew did. If so, I would certainly appreciate it, but if not, I could live with that arrangement." All we did was provide materials and labor and had a handshake agreement. I did offer to fix whatever she wanted to have fixed at my cost but she declined. I also want to do right. Your thoughts?