Cosmelan Mask and C2 Did Not Work - California

I followed all the steps. the do's and don'ts exactly and after 2 masks and 2 months of C2 later, there is very little to no change. I am apparently in the 5% that it doesn't work on. I'm so very disappointed a feel hopeless as I've tried so many other products. Not to mention $900 less in my pocket.