Virgin active cancelled still deducting money

I cancelled my contract in writing and on the phone with Virgin active in July.. They have now charged me 2 months longer plus more than my original contract. And they not suppose to as well as they offered people 50%off 2 months yet they are charging me more than my contract. Please stop as I am a student and need my money back they broke the contract due to Covid and no gym. See attached documentation. Contract cancelled in July. Contract amount R439 Been deducted 15th Sep R463 18th Sept R688 30th Sep R476. 96