They might cancel the rest of your roundtrip ticket and refuse give you a refund, or they might ignore it for a while and then ban you, or they might do random

They might cancel the rest of your roundtrip ticket and refuse give you a refund, or they might ignore it for a while and then ban you, or they might do random things like refusing to honor ff miles. There are no rules to protect you and no one to complain to except the airline's customer service. Care to roll the dice? :-)