I just tried to buy 2000 Lindens via the market place tab - received a message that the payment had been accepted but the delivery had failed and to contact support (I've put in a ticket as it's late and I don't want to be on the phone for an age).
There is no record of this in the account transaction history - I also bought 1000 Lindens using the FS viewer this morning, I have not received them either and that transaction is not showing up. I had been having issues with my balance not showing up without a relog, so just thought that had happened and that they would be there when I logged in later. But no.
Has the issue been resolved for you Aishagain?