You aren't required to attend if you don't want to. There is no contract that requires attendance, although obviously if you want to attend that's the only time you have to pay
And abbafan is right. Once you haven't attended for 4 weeks, you lose access to the website and app. And if you decided to return to group you would need to pay the joining fee again.
Sorry that you didn't feel that SW was the right plan for you. I hope you find one that suits you better
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