This company is TruGreen Chemlawn.  We canceled service with them a number of months back, but starting 6/25 they have been very persistent regarding calling.  The first two times my wife told them to put her on the do not call list and hung up, only to have the same number call her back.  The third time (this evening) she asked to be put on the do not call list and said that if they call again, we will be filing a complaint.