Regardless of what the dealer says the bet is, if a player whose turn it is to act, says "I call", they are calling whatever the actual bet is.
Once that player said call, they are committed to calling the amount of the bet. Mucking his cards does not change anything. He owes the 125, and his hand is dead.
49: Accepted Action
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 others. If a caller requests a count but receives incorrect information from a dealer or player, then pushes out that amount or declares call, the caller has accepted the full correct action and is subject to the correct wager or all-in amount. As with all situations, Rule 1 may apply at TD’s discretion. See also RP-12.