SAA unauthorised processing of international flight tickets

I booked two international flights in November using a credit card. SAA obtained authorisation and both tickets were processed against my card. With no further approval from myself, the SAA Call Centre processed the two flights again some two weeks later and for the love of me, I cannot get anyone at SAA to own the problem and process my refund. I am now out of pocket by over R20,000 and despite multiple (as in more than 5 attempts) on each channel (Call Centre, email and the Refunds department ) - all I get is COMPLETE SILENCE. No wonder SAA pleads for more money every year. This is abysmal service, to say the least. I would appreciate a response but am not holding my breath...