Why challenge the fact that a firm does not want your business, and there is no one or organization that can that can or would help you.
You could file a complaint with FINRA, but you better be on sound ground when doing so. Your complaint must be in writing (not e-mails) and provide a detailed itemization of your complaint with dates, time and individuals involved. FINRA will notify the firm and will order them to file a complete detailed response.
The response will be reviewed and a decision will be made.
HOWEVER, if your complaint is not well founded and FINRA supports the firm's position, the firm can (and should) report you to MIF, a customer reporting agency used by most brokerage firms who will include your name on a "blackball" list which is distributed to other firms.
I've been in brokerage management for many years, based on the information (or the lack thereof) you provided, without particulars, I would throw you out also ,
from The Streeet