Scrap for the white Galaxy Tab

I too have this leather case / cover bought for my Galaxy Tab end of December 2012..
The fit is good, but the recesses are somewhat scarce, ie front and rear camera lens partly covered.
If I want to charge the Tab, I have to solve the Velcro and pull out the tab slightly.
And now it comes: Just like in the pictures of M. Wosnitzka my white Galaxy Tab has black discoloration of the shell. And that !!! just after 20 days
This is a mess !!! The spots I get not even by polishing away.
Apart from that, I have about 25 paid and about 1 1/2 weeks later, the price is now at about 15.
So absolutely unfit for the White Galaxy Tab.
Possibly I'm going to sue for damages.