Spending too much and did not getting anything's make sure you have setup a campaigns wiesly and in under a professional fb marketing expert. I suggest to stop this campaigns and first post something viral and then boost it for $5 you will get approx 10k likes then spend maximum 30$ to 50$ and reach thousands of people and then promote your offer then you will surly get sales and conversion for more help and support ask in a any facebook marketing related groups.