Sounds like you've been through an ordeal - real estate taxes currently owed and past due should have been paid through your escrow. You received at the close of escrow a HUD-1 Settlement Statement - typically a legal size document with lots of lines, and a breakdown of all the fees/charges paid through escrow.
When you completed your transaction besides the Escrow Company you should have also used a Title Company - someone like First American Title, Fidelity Title, etc. Each of these title companies are underwritten and even if your escrow and title have both gone out of business, the title company's underwriter is still in business.
You need to find a copy of your Owner's Title Policy, call the number on the policy and reference the title order number. If you cannot find a copy of the policy then call a local title company such as First American Title @ (770) 761-6546, and ask them to look up your street address and find out who the title insurer was of your title 7 years ago.
I hope that this is helpful information and I wish you the best of luck - because the next step may be an attorney http://(www.LegalShield.com/hub/StoebeL
Tamara Stoebe, REALTOR/Notary
GRI, e-PRO, CHS, QSC
DRE License #01827461
Prudential Troth REALTORS
1801 W. Ave. K
Lancaster, CA 93534
Fax (661) 422-3006