What rights do you have when a gym has been overcharging you?

Question Details:

I signed up for a gym and the original terms and conditions on the contract stated that a family membership is capped at 2 children. We had a 3rd child and added her onto our membership. We never signed another contract when we added her. I just found out the gym has been overcharging us for 2 years and asked for a refund. They said no and told us that if our 3rd child wants to continue to use the gym we have to sign a new contract. They told us we should have had to sign a new contract when we added her and our original contract was not valid. What can we do?

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