Difficulty With The Cancellation Process

I've been trying to cancel my membership after it has expired in February 2021 without any success. I got charged for the month of March which is okay because I didn't send the notice on time.

However, I sent an e-mail on the 21st of February requesting the cancellation of the membership as it has already expired and I have paid my last installment of the contract. I have not received any response from the gym and I am afraid that I will be charged again with the gym claiming that I did not send a notice. I won't be able to afford it anymore as I am now a student. I DO NOT want to continue with the gym. Please assist.