  In this article we analyze an effective action derived from a 7-dimensional
$BF$ theory that, upon dimensional reduction, it transforms into an effective
4-dimensional action. Such resulting effective action involves a generic
metric; however, we study a cosmological model described by a de Sitter
universe, with a Hubble constant $H_{0}=67.70 \,\rm [km\, s^{-1}\,Mpc^{-1}]$.
We compute the barotropic parameter $\omega \equiv p/\rho$ to analyze our
solutions. Three different upshots are presented, where this model can transit
from quintessence to the phantom regimes, crossing the theoretical phantom
divide line. Thus the effective $BF$ action represents a quintom scenario.
