SanDisk Cruzer Blade 16GB write protected error

Oh well I can honestly say this is not a microsoft proble!  I was happily using a SANDISB cruzer Edge 16GB on a mac and a linux box.  Always ejecting(sic) the stick before removing.  For some reason best known to the stick it went read-only on the middle of a multi file transfer. I have been unable to write to, format or partition the disk since.  How do I get a replacement for this product?  This thread has had over 7000 views so it’s not an isolated case.