Have you recently applied for a loan? Have you noticed a big increase of unsolicited sales calls from other lenders soon after applying for your loan? It wouldn't make sense that your lender would take your loan application and immediately sell your contact information to a competing lender--- and indeed thats not happening here.
The culprits are the three big credit reporting agencies. They are actually taking your lender's FICO score inquiry and turning it into a sales lead. Amazingly, they sell your personal financial information to financial institutions who wind up contacting you. All this happens when your local mortgage company/lender checks your credit to provide you a rate quote.
How do you protect yourself? You can tell the credit reporting agencies that you want to opt-out and not have your name sold. Learn more by going to the website https://www.optoutprescreen.com.