That error typically indicates that mobile transactions are still in progress, pending, or waiting for funds to be transferred. That is rarely an actual game issue. I would first check your mobile transactions to see if any are not completed.
Then I would check the bank that your payment method is linked to and check for the same. If you do not see anything listed there as pending or incomplete, set up a case in the game, and the mobile team can check out the logs on their end.
he only thing they cannot do is see the bank side of transactions. Only pending ones that have not been processed yet.