Tfg robbing consumers!!!

I ordered a product online that was clearly marked at a wrong price, but as the customer I am entitled to the item at the advertised price I was then told that the item is out of stock so I will be refunded the only reason Sterns is doing this is because they do not want to fork out the item at the 90%discounted price.. I then went online a day after I was told it was out of stock and low and behold.. There it was advertised again so I purchased it again....if it was out of stock as they say surely it should have been removed?? I have emailed and phoned countless time and I have still not gotten a response... Absolutely pathetic service from such a big brand of stores!!!!