No Response to Query

I am a Platinum Member with SAA Voyager and sent a complaint about not receiving upgrades on flights even though there were plenty of open seats in business class. I have written 2 emails to the customer care email address, the first on the 11th November and again on the 12th November. To date I have not even had a confirmation of receipt from them to address my query. If this is the way that they treat their Platinum members , I would hate to see how they treat the rest of their members.