I have a customer that lives in california but has a house in my area that she rents to someone. I sent her last bill of the season and she sends me a letter saying that she had cancelled my service back in august and sent a letter stating that. She also states that her tenant claims that I was never there to mow which is untrue. She also claims that she had another LCO mow her lawn yet her grass was always as long as can be when I got there and there was no proof of any other mowers on her lawn unless they followed my patterns to a T every other week. Now, I never recieved a letter from her cancelling my service. I am going to file a lein on her house if she refuses to pay but is there a way that I can prove that she didnt send a letter other than me verbally stating I never ricieved it? A copy means nothing on her part, that can easily be fabricated after the fact. I sent her an email disputing her cancellation letter that she allegedly sent. Also, I have here signed contract stating in the contract that I MUST have a letter sent stating that they want to canel service. Any thoughts on my next steps?