E-Z Mart complaint: False Advertising

Went in to purchase WD-40, the price tag showed $5.99 but it rang up for $7.99, when I pointed it out to the cashier she stated that another customer must have put it in wrong spot. I then went and grabbed the inventory sticker so that I could show her and she said it doesnt matter. The price is whatever it rings up for that it is illegal to change the price that it rings up for. She got an attitude as soon as I mentioned the price difference. I stated to her that it was illegal to not honor the price advertised and that it was false advertising. She then proceeded to get extremely rude and argumentative saying that walmart doesnt even honor the prices marked, it cost whatever it rings up for period, take it or leave it. Being that it was currently the only store open I had to choice since I needed it to do work on my car so that it would be able to make it home.