Mango Airlines canceling flights!

Mango just cancelled our return flight from Durban to Jhb...We are now stuck on Durban, call Centre is not picking phones no one is saying anything. We now have to find our way back to Jhb, over and above paying for our tickets. Why did Mango take orders when they knew that they are not going to duldil their size of the transaction. This is ********* what they did. Other airlines are charging double the original price we paid. It's just not right.