how to prevent my information from public

[Jay Cai]

Hi, I am new to real estate investment. After closing my recent two purchases,  I receive more and more marketing mails. I have a feeling that my home address and phone number are public somewhere. 

I think there might be a system for mortgage brokers or lenders to find my information, as I received many mails having my mortgage rate, amount, my mortgage broker's name. These mailes say they can provide better rate for me. 

Another group of mails are for the titles.  Some mails state I need to pay some title fees, and ask me to send them a payment. Others say they are interest in my recent purchases and want to buy my recent purchased houses.  I also received some text messages on my phone, saying they want to purchase my house. 

I feel uncomfortable that my personal information is in public.  Can anyone give me suggestions to prevent it?

I am thinking to register a physical address in UPS and use that for future mortgage applications and title registration. However, my mortgage broker said the underwrite won't allow that. And the title company told me I will need to physically sign documents every time for a new mortgage or refinance if I use a registered address different from my actual home address.