Sandisk never more!!!!

I have purchased two SanDisk cards 16GB in two different times, both of them at Duty Free Store at Rio de Janeiro International Airport, sealed packs and the 2 SD cards did not work since the first time I inserted them at my Sony A230 camera. The message is always corrupted card and they not open on Windows neither Android OS, Linux OS is able to recognize them but also do not open the cards. I have any problem with my Sony 16GB SD card. SanDisk never more, I love and respect my money!