**** advertising

I bought a product from Takealot's online platform (order nr ***7). The product was indicated as in stock and to be delivered after lockdown, which I was happy with. I then proceeded to pay for the product, partly with a voucher and partly through credit card. Takealot have send me a mail on the 29th of May to say that they now do not have the product in stock anymore and that they will give me a credit..... Great business concept.... Advertise the world and when you can not deliver give a credit that can only be spend with you???? Is this even allowed?