Need help

I live in Aurora Colorado where pit bulls are banned my puppy got out of the house yesterday she's a service dog they don't want to give her to me cuz they're saying she is a pitbull
she's not a Pitbull she's a king corso and bulldog mix what can I do because they don't want to give her to me and me and my family want her back we miss her and the lady that we were talking to was being very rude and she really didn't care about anyting that we were saying.