Is someone maybe using my social?

I have been trying to dispute a account with Equifax. And bits having me verify questions. Saying I may have opened a mortgage or retail card two years ago which I haven't the only question I see is accurate is my bankcard information. Can someone use my social with their name? How do I find out this information? I filed for bankruptcy three yrs ago and got my credit back good yr after could someone be using my info. I don't see anything that's not mine when reviewing my file. So how can I find out if someone may be using m social under another name and address like the do with the CPN?

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