False advertising

I placed an order for an item advertised in stock on takealot on 27 Jan 2020. This was for my partners 40th birthday present. The item arrived on 5 Feb 2020 (which is a lot longer than they normally take to deliver - I have generally received items ordered a day or two later). The item was not what I ordered. It was similar but definitely not what I ordered. I advised them the very same day that it was the incorrect item and that I needed them to replaced the item ASAP as my partners birthday was on 11 Feb. The item was only collected on Monday 10 Feb and I was only advised on 12 Feb that unfortunately they do not have stock of the item and that I have a takealot credit for my next order. I find this completely unacceptable. How do you advertise they have stock of an item; send their customer the incorrect item and then ruin my partners gift by forcing me to find a "second-best" alternative to his gift and then add insult to injury by not refunding me my money. So now I am out of pocket and out of the actual gift I wanted for my partner. This is unprofessional and unfair.