Home Security Commitment Period

Can someone advise where in the Telus agreement there is a definition of the Commitment Period as it relates to Telus Home Security?

We've had a Home Security agreement with Telus for 36 months and those 36 months ended 14.5 months ago. Only reason we contracted with Telus in the first place is because we have been ADT customers before. We have been dissatisfied with Telus' Home Security services all along because even though we have the Control Plus Video service, they never call when the alarm goes off.

We canceled 2 days ago only to be advised that we need to return the equipment, which is probably fully depreciated by now. First we were told that we need to return  the equipment without specific which, when asked for clarification since we had purchased some of the equipment upfront, the customer loyalty rep came back and advised we only need to return the Main Control Panel. It felt like the decision of which equipment to return is very subjective and determined by the customer loyalty rep.

We have since reviewed our Customer Service Agreement with Telus and can't find a definition of "Commitment" period even though this term is capitalized in the schedule of service charges included in the agreement.

My questions to Telus and the community are:

How can a key term in the agreement in regulating the relationship between Telus and its Home Security customers like the term "Commitment period" not be defined? What does it mean - what is the customer committing to, and what is Telus committing to during that Commitment period?

In the case of mobility agreements, a mobile phone, which is much more expensive than a Main Control Panel, is not returned at the end of a commitment period. Why would a Main Control Panel worth $300 new need to be returned after 4+ years into its life and as such probably fully depreciated?