Bolivian operator and licensed crew, hence Colombia not being the issuing authority cannot pull licences. Most severe, but most unlikely consequence, a ban from Colombian airspace for the operator.
To answer sandiego89`s question in full, Medellin ATC would have written it up and filed it with aerocivil, that is if they had not made it to the gate but needed a tow off the rwy. As some distruption would have ensued to operations. Should they however managed it to the apron, chances are nothing further would have happened.