Membership Cancellation> Please Help !!

I have opened my membership in June 2023 i have ever been to the gym just 1 day, thereafter i have called someone to ask them to cancel my membership due to financial problems, they have told me to pay an amount of R3500 to close the membership and i don't have such money to do so i have sent emails out and have gotten no response. i received an SMS after saying my account is in arrears of R27** please pay up. please can someone help so i can cancel my membership as i don't have the funds to cover this and since i have only been to the gym just for 1 day.