There was a bug allowing users to merge their account with binance under certain conditions. It is now fixed (Please note that however, there was a message telling not to merge if you were sending to an exchange)
For your problem, please contact the binance support and tell them that the payment was made using a "merge_account" operation instead of a "payment" operation.
Make sure to provide the transaction id or a link to the transaction.
They should credit your lumens asap!