yes you could, however lets say £100 per yr ?
let say the visit costs £50, 1 man 1 hour of travelling & on site time , 30mins of admin time, including a vehicle NI pension & all that stuff
that's less than £1 a week to provide a 365 day 24hr service, with out maintenance in place you'll be unlikely to find anyone who'll want to repair an alarm at short notice or out of hours
you may find that having the alarm maintained is a requirement of dad's contents insurance, I'd advise checking the policy before making changes
however if you don't want it don't have it, well your dad will have to inform the provider in writing ...