Stop Debiting my account!!!!

Im really upset with Capitec i have paid up an account years ago and they still keep debit my account but the account was paid up.they evn sent me an email to prove its paid up years later they start debiting an evn higher amount then suppose to.this needs to stop as i dnt evn use the account being debited and this is also against popi act as there was no debi check for this debit order