Al4xms

Moved into this house in 2020. It has an old (probably as old as the house, 20 years) alarm. There is a bell box (unknown brand) And a veritas 8c texecon panel. I can't find any other box. Apparently there may not be one? So I never use this alarm. But it randomly goes off. The panel buzzes and the bell box rings. It has done this at completely random times. Not power cuts. I'm concerned it's going to do it while I'm on holiday and drive the neighbours crazy How do I disconnect the alarm? I've heard everything from smash the box to hire someone to get a ladder, open the box and cut the wires. I tried removing the fuse from the panel. The panel went off but the bell box kept going. How do I silence this forever?