Most similar spells like wall of fire have descriptions that specifically prevent a creature from being dealt the spell's damage multiple times per turn, but prismatic wall is worded differently.
As written, it seems like a creature could be affected by the prismatic wall multiple times during a turn. However, it's trivial for a grappler to drag an enemy through the prismatic wall, like, three times then finally shove the enemy through the wall, dealing the enemy about 700 points of damage and probably rendering the enemy petrified. This is well beyond even other 9th-level spells.
Can a creature be affected by the prismatic wall more than once per turn?