This isn't a bug. It's by design.
You aren't getting spam calls because you made a mistake. You're getting them because your name, address, and phone number are a line item on a spreadsheet. Data brokers aggregate public records and sell your profile in bulk. Telemarketers buy it. Scammers buy it. The calls follow.
You have the legal right to opt out of every single one. But the forms are intentionally buried. Some require notarized letters. Most re-list you within 90 days from refreshed public records. The system is designed to make the work expensive enough that you give up.
We do the work. Every 30 days. Until you tell us to stop.