Device no longer usable after cancelling with 5 weeks left on my subscription

I cancelled my subscription this morning after about 11 months of daily usage. It just wasn't delivering enough value for me to keep using. I still have 5 weeks left on my subscription but wanted to cancel so I do not forget and get charged for a year.

Immediately upon cancelling the strap becomes a brick even with time left on your subscription. I have no plans to keep wearing the strap but this is such a BS move from the company...you'd think at a minimum they'd encourage you to keep using the banks until your subscription runs out. I almost want to ask for a refund or file a credit card dispute for 1/12 of the subscription cost out of principle but it's not worth the brain damage.