My ex-wife moved all her CC debt onto an old card I unknowingly am still on and stopped paying. What can I do?

Card opened in 1993. Divorced in 1997. The bank allowed balance transfers from her other credit card accounts in August 2009 without notifying me and when she started to fall behind, they negotiated terms with her directly. (This is odd since the minute I step one foot into Mexico I get a call from the banks' security center, but $12K dumped from an ex-wife, no call.)

When she broke the payment terms I am now responsible and notified. My good credit is shot. The bank reduced the available balance on my credit card from $25K to $700. They won't let me off the card even though she has admitted doing this without my knowledge or consent and we have signed their papers. She is now not credit worthy.I feel the bank is complicit in this fraud. Do I have to file a police report against her?