False advertising

I bought a Tv (online) on Black Friday and I followed up with HiFi six days later and only then they are telling me they don't have stock and nothing is ordered so it is pointless for me to wait for the product. They will refund me in 14 Days

I asked them to give me another Tv that was on special on black Friday with the Black Friday price I will pay the difference HiFi refused to do so.

The worse thing is another vendor was selling the same product at a discounted price If their system had a function that states when there is no stock I could've gone to the other vendor.