[hello, i want know for what i cant buy lindens, my card is ok, and i put alll info in my profile]

i try buy linden dollar with my card visa but i cant and i want buy lindens can you helpme? my card is a debit visa and is asociate with a banck account but i try with the card and i try with paypal but i cant buy lindens and i dont understand, i need contact with lindens labs? im not sure how i can contact ,