Horrible Refund Process

I received a complimentary flight from a supplier in the UK, but at the counter I was told I needed the original credit card to board the flight MXHHQK. That was going to be impossible to do quickly so I was advised to pay the second time out of my own pocket and was given a voucher number ***M so I can get back my money, not knowing that Mango can only refund the original credit card (this info was not provided to me). So I just lost R1,800. NEVER FLYING THIS HORRIBLE AIRLINE EVER AGAIN!!! I was given an email address which does not exist to get my refund. I tried emailing enquirers a few times and never got a reply. I called today and was told about the rule that only the original card will be refunded in 14 days from now and there is nothing anybody can do to help. I'm going to lodge a complaint with the Consumer Protection.