Shocking Service!

Made a booking, it was fine until Comair Liquidated and they are not updating my flights. I am trying to change my flight dates, and they came me one price of just over R1 000 and then came back with a different price of just over R11 000? Now trying to get hold of them to cancel flights and there is no response from emails or phone calls. Have been holding on for up to an hour! Unacceptable!