No, they can't do anything of this sort to you. Moreover, you should know that according to the Fair Debt Collections Practices Act (FDCPA), no collection agency can threaten you in order to collect the debt. If they do, they are in
violation of FDCPA. You can file a complaint about them with the Federal Trade Commission, and your State Attorney General.
You should also know that they are not supposed to call you before 8 A.M. or after 9 P.M. If they do, this too will be considered a violation. For more details on FDCPA rules you can check
http://www.debtconsolidationcare.com/fdcpa.html .