I am new to Bitcoins. Due to long syncinc of bitcoin-qt I have transfered Bitcoins to late. The address was probubly already outdated. But my ammount in Wallet was reduced and Transaction took place. As result the Seller did not get my Bitcoins but I paied it.
Please, please help!
You have to contact the seller. Nobody else can help.
The seller provided you with a bitcoin address. You sent bitcoins to that address. Now they either need to send you whatever you purchased, or they need to send you back the bitcoins, or they need to explain their policy about late payments. If they do none of theses, then it was just a scam, and you sent your money to a thief.