UNFAIR charges for ITEM SUPPORT after support policy launched?

Could you please any one define me the actual support policy pricing structure, because envato charged author fee for six month support and 12 month support.

The exact support fee(which one is posted on item page ) for 12 month’s not credited to my account.

What is author fee? envato charged author fee for everything (item sale, six month support, 12 month support).