Encore Capital Group Debt Collection Complaint

Encore Capital Group Debt collection department,

Other (phone, health club, etc.) Cont'd attempts collect debt not owed Debt is not mine Illinois

I have been a victim of Identity theft as a result several accounts were opened in my name . I have sent a letter to the collection agencies letting them know the debt is not mine but they still report me negatively to the credit bureaus and claim I did not provide sufficient information to investigate. I do not understand this I have sent them a letter letting them know I am unaware and have no knowledge of this account and it is fraud, in addition I sent the account information that is reporting on my credit report from MCM.