JuliaPR,
A CA, particularly Resurgent, is going to ignore you. Don't contact the CA any further. In fact, you need to DV the CA right away.
Did you file a police report? If not, do it.
Send a copy of the police report to the CRAs and tell 'em this account is not yours. Send your letter CMRRR, and include a copy of your Driver's License and SSN card. Normally with the CRAs, I recommend making nice. But with ID theft, you need to use a bigger hammer with the CRAs.