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If you legitimately can sign a sworn statement that you did not open the account, then you can file a police report, which will gain you two benefits.
First, you can send the police report to the CRA and get any negative reporting they have made blocked from your credit report under the provisions of FCRA 605B.
Second, you can also send a copy of the police report to the creditor and request any and all business records in their possession related to the opening and use of the account, as specfied under FCRA 609(e). They then cannot refuse to provide those records, which will then enable you to assess the legtitmacy of the account.