Multiple problems - No stock/wrong order

So I placed an order for a 2TB for R830 from the unboxed deals.. I said I'll pay via EFT and I got an email stating \thanks for shopping at takealot\". I usually select EFT and then pay for the item later when I'm home. I've done this for years now and spend over 70k just this year with Takealot. I got a call from them saying the item I bought is out of stock and I paid hours after I placed the order and they work on first come first serve basis. Strange thing is when you order they tell you the amount of stock left in the warehouse. Then they said they can give me a new one but for a lot more or refund me. So do you advertise a product that you don't really even have and try to get people to just buy a new one then? This is unacceptable. Nowhere does it state that if I don't pay I will not get it and I didn't get any information that it will be cancelled. The other order was for a Aqualine boys suite and instead I got some beach mat. Now the Aqualine is also sold out so I'm guessing I'm not getting one of them as well? So can someone please assist or can I write my email to the ombudsman because here's several things wrong that I can easily point out in my defense."