Supertech — CV9, supertech capetown

I have booked the apartment in 2015 in CV9 tower, supertech Capetown and was supposed to get the possession in 2017 and still no update regarding the possession of the flat. I already tried calling and visiting the office but no one gives a proper reply. They always say it will be completed during Diwali or next March.
In recent call they told me the possession will happen in March but when I visited the site, I realized the building is still under construction.
At least they can provide the right information and stop cheating us.