Bike Seatpost Slipping

Help with my seatpost/clamp please…?

Hi, I just bought a GT Avalanche 1.0 MTB.
It has an alloy micro adjust seatpost, and a forged aluminium quick release.seat binder.
Every time i ride it, the post keeps gradually slipping down into the bike, making the seat lower, no matter how tightly i fasten it.
Any ideas on how i can stop it?
Could it be because the post is kind of painted black, which is coming off where its been clamped?

get rid of the quick release clamp and get one like this: http://www.performancebike.com/shop/profile.cfm?SKU=12690&subcategory_ID=5260 It will work much better and hold the seat no matter what. As most other answers say take it back to where you bought it and size the post up for one of these and you will NEVER have this problem again!
It does not have anything to do with the paint coming off the post it just isnt the right size…

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