Please remove if this was the wrong place but I’m not sure where else to go with this question.

I have a nice used NAD amp as my tv speakers, but my shitty neighbor’s kid who has stolen from me, slashed my tires and graffitied my house, keeps joining my amps Bluetooth and blaring some Mexican-politics podcast or some shitty metal music. I’ve taken the BT antenna off, changed the device name, but I’m unsure what to do. I don’t need the BT but I like it. Is there a way to shorten the range? Or protect the BT network? I’m open to any ideas.