Was the reservation actually canceled or did you end up paying the $1100 and become a no show where you lose the value of your flights as well.
Southwest has no cancel fees and during IROPS (delays with a missed connection) no fee to change a flight (no cost to change ever but in this case no fare difference collected) if the delay was minor they may make you pay a fare difference to change flights but unfortunately I'm afraid you got scammed.
The only other thing I can think of is did you end up talking to the southwest vacations team which is awful from what I hear. Was it a package booking
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