myself and my daughter's social security number were used for taxes, how can i get them to do a fraud thing?

I was told that myself and my daughter thats 3 years old were claimed on taxes by my ex boyfriend of 3 months he lived here at my house and i found out he was using drugs and i kicked him out! But he got ahold of my social security number and my daughters, what can i do!! PLEASE HELP ME!

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