One of my commercial accts. mailed me a notice asking why I was billing them and not performing the sevices we agreed on...when infact we were there. So, now they don't want to pay, and their telling me that if I can't perform the duties that they will find someone else. I have no actual proof we were there, but gave her my word, which didn't seem to be enough for her. So I thought it would be a good idea to keep track of the time and duties that were performed for all accts.? Any thoughts? And, they're also 2 months behind on payment.