The numbers add up perfectly, exactly like advertized. 0.0005 ETH price for one token. For every 10 token bought you received one extra (in the pre-ico bonus sale ONLY, which happened few days before the ICO). What is there false advertizing? How much ETH did you transfer and how many tokens did you receive?
ETH and every other cryptocurrency has huge volatility towards the US$. Any calculation in US$ in any cryptocurrency is just a price for right now and a broad estimation for future prices and was never advertized as fixed price in US$.