Scammed into signing up for home security system

I have similar experience where a rep called me and said that I can have Home Security added to my account for same price I was paying for other services.  I even asked if there was catch and lady insisted that there is no catch.  To my surprise I see a separate bill for home security which includes installation of $300 which is separate from my regular services.  All the guy did was plugin a camera in my garage to an outlet and they gave me 2 smart plugs.  I can purchase these items cheaper on Amazon.  Been trying to get a hold of someone at Telus for 3 days without any luck.  Do not get suckered into signing up for Home Security plan.