Unauthorized Debits after cancellation

Cancelled my membership in May with Gym Company Randburg Square, paying the money due for that last month as well as the required cancellation fee, meaning they were not supposed to debit in June and going forward, they debited in June and i had to reverse the DO which costs me, again now in july they have debited even after i alerted them of the mistake in june and they agreed their admin processed the cancellation late and again this month same sick story - need them to refund the july DO urgently and STOP deducting money ********ly from my account as i paid them what was due to them

Firstly they sell R99 membership and secretly make you sign the R199 monthly charge which you cant change after and now this ******* after the 36months not declared upfront contract!!!