Makro South Africa has no customer service

I am beyond frustrated. I made an online order on the 29th of November and paid via instant EFT. My bank shows that payment to Makro was successful but according to Makro they are still awaiting payment. I have emailed them several times with proof of payment but have received no response. I have sent them messages via Facebook and Instagram also to no avail. Their live chat option does not work and neither does their WhatsApp option. I am beyond concerned as their website states that if payment is not received that my order will be cancelled. BUT I HAVE PAID. I am afraid I will lose my money and the ordered items and do not know what I can do to have the issue resolved urgently