Brinks as stand-alone alarm

[jeremy_ho@xxxxxxxxxxx (jj3000)]

If the brinks sales rep says after 2-3 year contract is over and I
wish to discontinue the monitoring service, the alarm will still
detect entry/smoke/motion and make sound, only without the monitoring.
  (stand-alone)

Is that true ?  How can I hold this promise from them in writing, or
whatever.
I am afraid they might simply disconnect and make my alarm "not ready"
and I have a non-functional scrap metal box in my house.  Like it is
now after I bought the house.

Does anyone have experience in this situation?  Do you get the alarm
to be stand-alone after the contract is over?

I do want a monitoring service for the next couple of years but I
would like the eventual option of having a standalone (instead to
being forced to sign up for another 3 year contract)

The alarm was originally installed in 2001 by previous owner (model
BHS 2000).  Probably is technology from 1980s.  But my tiny house only
have 2 rooms I don't see why I should rip this stuff all out and put
it another system myself.  No option for remote control and wireless
sensor, but honestly it is probably adequate for my needs.