well I firstly wait for the next month and see if the same person rates me the same and then I send them a message just to explain where I have let them down, as the poor rating without an explanation isn't going to help anyone.
I have found mainly that it was a matter of mis-communication as I was given a number 1 because they thought I was number 1 and when they received my message they were very unhappy about the mistake they had made in reading the instructions.