Migration topups are mostly DBR topups.
DBR topups mean that money is deducted only on daily basis.
It can be free in rare cases only.
If you tell us the name of your topup then we can give you full details of it.
HBO hits HD is Rs.2 per day. Max HD is Rs.7.50/day. Mtunes HD is Rs.1.70/day. History HD is Rs.2.10/day. Dummy topup is free but has no channels in it.