Start by pulling the ppm and the account opening documents with this firm. There may be an arbitration clause and a forum selection clause. This would limit your ability to pursue legal action if for instance they were out of state. If there investment policies or procedures stated in the ppm wasn't what took place in practice than you may have a claim. Good luck!
Most likely not for a number of different reasons. This investment took place in 2007, so after 6 years most all claims would be time barred. Also the act of processing a credit card doesn't necessarily provide any proof of any culpable negligence. Best bet is to contact your state's division of securities and hope that after a criminal prosecution ensues you will be awarded some level of restitution you can collect. Good luck.
If the settlements are so significant that you think it will change what alimony and or child support might be owed to you then consult with your divorce attorney and consider issuing him a subpoena to obtain those records.