Beware of Mango Airlines

I booked a same day return flight last Friday to fly this Saturday. I receive a text message on Monday afternoon advising that the flight I booked is now leaving almost 2 hours later than initially scheduled. I am scheduled to fly back the same day which now does not leave me enough time to complete the business I am going to Durban to do. Despite numerous attempts, I finally get hold of an agent at Mango and I requested that my return flight be changed to a later flight so that I can accomplish what I am going to Durban to do - and I am advised that I need to pay to make these changes. This is absolutely ridiculous that this airline has the power to make these changes and cannot accommodate a reasonable request. Essentially I just wasted an entire flight cost because Mango decides to do what they feel like doing. Surely this is not acceptable business practice - no wonder the airline business is slowly disintegrating.