Outsourcing to unreliable and ***** 3rd party aircraft, delayed for hours, then refunded 20% of ticket price

Flight was delayed from 7 am until 1pm. Boarding was late, then ended up waiting for something to happen until 10.30, leaving us to sit inside the plane for three hours. The plane was some random Global airlines plane, completely white fuselage with no branding on, looked really ***** to begin with and then when the plane started moving the lights flickered off for a few seconds. Twenty minutes later we were still not moving because at the last minute some other electrical problem was found. We went back into the bay and kept being reassured we would leave shortly, which is what I kept telling my clients. Eventually we were offloaded and I was actually grateful to get off that plane because frankly it looked suspect and another passenger agreed. Then to add insult to injury I get an sms saying we will be given a voucher to make up for the delay. Called now to redeem the voucher and it is for R500. The flight cost R2500, not to mention the R1500 I lost for my return flight, parking at the airport and a wasted day! One of the meetings I missed was with the management team of our biggest client who were not pleased, to say the least. I fly often for business and always use Mango, but never again. Mango can go back on their records and see how much i have spent with them over the past 6 years flying for work and decide whether it was worth it to shortchange me for the full price of my ticket.