[Who do I talk to about a problem with the Second life Marketplace?]

I made a transaction for three items after the final calculation, I had 5,039 lindens before and only 3240 when it finished. Originally the cost was 1,799 but I removed one of the items. I was still charged for it, and didnt get the item. Is there any way I can regain the lost three hundred lindens? I have the transaction history that shows I paid for an item twice, but a screen shot of the final calculation shows one of each item. And I only received one of the item.

[I've just downloaded the new viewer but I can't figure out how to open my inventory.]

Thank you for the help.

[I've just downloaded the new viewer but I can't figure out how to open my inventory.]

Does anyone know why I don't have any of the menus at the top of the screen or why the inventory toolbar doesn't show on the right? Viewer 2-6-3-227447