First, File a complaint with the Consumer protection Bureau, Convergent will respond by attaching a pdf, claiming to call them and give them your social. Dispute that or call them and document what happened.
Then file another response dispute with CPB, stating what happened, even if they don't resolve anything its a record. File with the BBB , Also When they call you say," You are being recorded, what is your name, supervisors name, social security number, if they ask why, say so I know who to sue....
Get their address and phone send them the FDCPA verification letter find a good one online that states all the laws that apply.
Reason of review: Poor customer service.