After paying my total amount due for January on the 22nd i was invoiced again on the 27th,i called 808 and the explanation was that this amount has been accumulating as from Nov last year,and this amount is way above the total bill i normally pay on my top up contract,the agent explained that this is due to a conference call i made in Nov and apparently conference call charges are not deducted from the airtime on my acc but are billed separately...how true is this and when is the due date for this amount?