Technically, you have 2 possible rules that come into play here
Money placed in the pot, in turn, stays in the pot.
and
Poker is a game of alert, continuous observation. It is the caller’s responsibility to determine the correct amount of an opponent’s bet before calling, regardless of what is stated by the dealer or players. If a caller requests a count but receives incorrect information from the dealer or players, then places that amount in the pot, the caller is assumed to accept the full correct action & is subject to the correct wager or all-in amount.
The first is very clear, not really open to interpretation. So we know the 100 is bound unless you deem the situation worthy of using Rule 1.
The second is kind of open to interpretation. Whether or not you apply this rule depends on how you interpreted it.
I would bind the 100 and give them the option to call the rest or fold and sacrifice.