If consumers' rights and interests are damaged when purchasing or using goods or receiving services, they shall promptly complain to the local department that accepts product quality problems. Complaining in time is conducive to correctly judging the difference between the degree of damage and normal loss of goods, and can explain the situation more accurately, especially the problems related to service quality.
I suggest that it is beneficial for you to collect the following evidence:
1, you kept the contract and invoice when signing the annual card with their gym;
2. You can get (or entrust a friend to do it for you when it is inconvenient for you) the notice of relevant leave matters;
3. You keep it (a friend can take it for you) or a friendly person took the video of "leave note" (maybe there is a camera video at the front desk, which is better);
4. Print the telephone or SMS records (telephone list) related to its employees.