Stop ignoring me DUT Durban campus

Wow... I am a prospective student have have been trying to get a hold of the DUT admissions office since yesterday. Out of more than 40 times and more that I phoned she answered twice.

I am having trouble registering online and I have been locked out the system.

They sent me the acceptance letter yesterday and said that today is the last day of registration. How am I supposed to do so if no one is helping me. My whatsapp is being ignored as well.