Shocking Service False Advertising

I was sent a link of an advert on FB and was asked to buy a pair of shoes because it was "buy one get one free". I followed the link and the only option available was a so-called 'mega bundle' which I naturally assumed was part of the deal. I ordered the shoes and chose the color, but was puzzled as to why it did not ask me for two colors, since it was supposed to be buy one and get another. I chose none of the additional items since I did not want them. When the order came there was only one pair of shoes. I have written to their support twice and simply got a response, "the website was clear as to which offer was being made.". This was NOT true. The page the link took me to ONLY showed the "mega bundle". This amounts to false advertising and what is more, when I asked if I can return the item and re-order the 'buy one get one free', I was told it cant be done. I now have a pair of shoes at an exorbitant price of R1300 which I would never have bought had I known it was for only one pair of shoes. The customer support of this company is shocking and I would not advise anyone buying from them, even if the shoes are comfortable! The order number, beginning with BS, is very appropriate.