It's the dealership, not Toyota causing the problem.
Go to the showroom on a busy Saturday and as Hach suggested, speak to the general manager. If he/she seems to not get the message, walk to the middle of the showroom and yell as loud as you can "Do not under any circumstances give these people your cell phone number...". When the general manager says he's going to call the police, tell him you'll be calling your state attorney general's office unless he can absolutely guarantee that you will receive no more calls beginning RIGHT NOW.
He probably can't guarantee that. It may stop in a day or two. Next time it happens, immediately call your attorney general's office.