I won a Cell C compe...

I won a Cell C competition in August (flash word - R10 000) and no payment or communion about the prize from KFM since.... I received half of the amount and was notified that the second payment would be made in September after the competition ended. I have sent multiple emails, calls, DM's, WhatsApp and there is no correspondence. I would hate to have to reach out on a post on FB or Instagram.