I have that problem with a former utility company that keeps sending updates about the business that I've unsubscribed from multiple times. The one that irks me

I have that problem with a former utility company that keeps sending updates about the business that I've unsubscribed from multiple times. The one that irks me the most is TP-Link Kasa who has a marketing opt-out in the account creation flow and they still send repetitive spam without honoring the unsubscribe link.