A few common problem I am experiencing with alarm systems :

Your change armed response company and they offer a free alarm ... the installer doesnt have to time to strip the old system ... much like the COC's they make up the extra bucks with the add ons ... R20 000 for a few sensors and a an expander if you lucky is not uncommon ... not a big deal ?

They use the keypad to program the system ... not a big deal.

They reconnect the old wires to the new panel ... not a big deal ?

They dont replace the old system transformer ... not a big deal ?

You decide to get a highly recommended alarm technician to upgrade your alarm to a better system ... with wireless detectors and wireless remote receivers ... an app to control the system ... adds remotes to arm and disarm the system using the zones ... and a whole list of other things ... not a big deal ?

They are actually big deals.