PHOENIX -- An old trick is back and it involves cases of door-to-door salesmen offering to upgrade your existing alarm system for something better.
Sue Fong was profiled a few years ago when she says she was duped.
"I thought that they were just updating equipment that I had," she said.
She's not alone. Last year, Betty Quesada told 3 On Your Side the same thing happened to her. She claimed a salesperson convinced her into thinking she was dropping her current alarm system for a new one but actually wound up having two alarm companies at one time.
"I was upset and I’m still upset because I hate having to pay two companies for the same thing," she said.
3 On Your Side suggests that if someone knocks on your door offering to upgrade your alarm system, simply close the door and call your current provider to verify.
The Arizona Alarm Association, a nonprofit organization that represents burglar alarm companies, tells consumers to make sure the alarm company is licensed through the Arizona Registrar of Contractors.
The association also says you should check out three to four different companies and arrange an appointment before signing any paperwork.
Finally, remember to ask for a written quote and check references.