We had our lawn sprayed by a company for weeds last spring. We thought it was a one time deal. We never signed a contract or asked for further service. Yesterday I recieved a bill on my door from the company who had treated the lawn again this spring without my asking them to. There is a line on the bill that says your service will continue from year to year unless we are notified. Can they do that? 1) Do I have to pay them 2) If I don't pay how can I avoid being sent to a collection agency?