Schwab Is Not Listed. I Filled Out An Application To Open An Account.

I was trying to do online banking with State Employee's Credit Union of North Carolina.  I was on that site and Schwab (broker)came up, which I thought was with the band and answered questions.  One being my social security number and secured questions.  I have been received many out of State phone calls, even my cell phone number.  I am scared that I have gave information out that can wipe us out.  What can I do?