Price gouging airline!!

This is probably a waste of time seeing as Airlink NEVER responds to complaints on this site. I would like to know how this airline arrives at the price for a return ticket Tete-Jhb return?? A year ago the cost of a return ticket was around ZAR 6500.00 today the price is just over ZAR 12 100.00!!! YES that's NOT a mistake!! ZAR 12 100.00 for a return ticket for a flight that is the equivalent distance Jhb to Cape Town. 1200kms Absolute *******!!