Maintaining burglar alarm system

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I had an alarm system installed 15 years ago. Previously I had a different system which was fully wired in. I didn't pay any monthly/yearly maintenance charges. I never had any problems.
Whilst having house refurbished I wanted to add a few extra bits to the system. Due to time factors needed done quickly and a colleague's father's company came out and added 3 extra wireless pirs.
For the past15 years I have paid £160 for them to come for 15 mins and every 5 or so years change the three batteries.
I am fed up paying this bearing in mind prior to that I had a fully wired in system. I would rather pay someone every 5 years to just change the three batteries and to pay for any possible emergency visits.
Problem is that the system is linked to their company (all the internal codes etc).
How do I get these voided so that i can be independent.
Important to note that I am not linked to police system.

Just bumping for more some responses.
Or maybe if anyone has a hard wired system, (as opposed to wireless) where they aren't connected to police and pay no annual service change?

have a look at the terms of the contract.

They have taken control of you so you feel you have to keeo giving them money.

Unless your home insurance policy requires you to have a maintained system (some do, if risk is high) you do not need to keep paying them.

You can ask them to tell you the engineers code. They might refuse, or say they will charge you some exhorbitant amount.

Ask around for a personal recommendation from someone you know and trust, not an advertising website, even if it is disguised as a recommendation site.

If you can find an independent, s/he can probably reset the panel to factory default (like you might do with a second-hand phone or computer) where the code might be something like 0000 or 1234. Insist that you want to know the number and you will not pay them if they change it to a number you don't know. You can change it to a number you will write down in a safe place, and not forget.

For what you've paid them over a few years, you could probably have bought a new control panel or even a new system.