ADT FIDELITY SECURITY POOR CUSTOMER SERVICE

So I have been with ADT since 2018, the adviser/salesman that helped me, explained that after a couple of years the security device would be owned by myself, then i would only be paying for ADTs services. so i cancelled with ADT a few months ago and the consultant then told me after 4 years that im still renting the device from ADT and they will be coming to collect the device, yet i know family members thats was paying the same premium which i was paying for a shorter period and they own the device. a person from adt then contacted me unannounced and said they infront of my house to uninstall the device. i then told them im not at home and they should ask a manager to call me. im now being charge a monthly premium as if i did not cancel my subscription and they have handed me over to lawyers.

im utterly disgusted in there customer service. i have told multiple ADT consultants that this was not agreed upon when i signed a contract with them. the consultants told me it is captured as a rented device on their side and i must take it up with the consultant which i havent heard of for 3years.