To start with this unprofessional but not unheard of. You as a candidate had to go through the hoops and loops of hiring process and when u have cleared it, the question was supposed to be asked before advertising for the role is thought of?My advice is to keep chasing them and speak to senior members of the HR team asking for what is the hiring process pending on and what are the timelines, make sure u will be made an offer by then. If the employer tries to evade commitment then they either don't know what they are doing or they are not very keen on hiring you and this case if I had something better I would go for it. Frustrating, is the word!