No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
if the OC is listed a balance then they still own the account...you need to look on your CR and see how the account is listed by the OC...If it is a $0 balance then most likely they sold it to the CA
More than likely, yes. But, who is listing on your CR? If only the CA is listing, then I would try to PFD them. If the OC and the CA is listing, then you could try to contact the OC and deal with them.