Ask indesit ?
If it's under warranty any door issues should be covered (do check).
Aside of that, maybe it's just new & stiff. Try a little oil.
It does occur to me that fridge & freezer doors can be difficult to open. When you open them warm room air rushes in, cold air rushes out. You close the door, the warm air cools and shrinks, creating suction which you have to overcome when you next open the door.
Could that be the issue ?