Missing 6.8 GB on Sandisk ultra m3.0 64 GB

As a consumer I am concerned about such open statements which can really imply that a 64 GB could be sold as 32 GB possible?. In a competitive market driven by Standards, the company should maintain their standards. So I would look forward to Sandisk helping to address this issue. The customer support has not yet confirmed the exact space it should show instead asked me to check on Mac OS. It was a good cue. I checked various USB drives on Mac and they show higher capacity than the printed. So the 64 GB should show 64 GB+ capacity on the mac. But in my case it shows 61.51 GB on Mac and 57.2 GB on windows instead of 64 GB on mac and 59.6 GB on Windows. I still await a resolution from Sandisk customer support.