I have had 17 months of fees for a monitoring service I thought I had cancelled

I have had 17 months of fees for a monitoring service I thought I had cancelled (we had about a 7 months of service beginning in December of 2020). I have no idea how this happened since we unplugged our devices 17 months ago and I closed the card on file. I sent an email because there is no way to dispute this or cancel service on the website. I hope someone calls me back to give a refund and close my account.