Debit order not going through

Have always loved vodacom,However i am abit annoyed, vodacom has not been debiting my account and now decides to list for a missed payment on transunion which is disappointing as immediately when i noticed i haven’t been debited, j did a payment via the vodapay app so why list me? When i clearly instructed that you guys debit me youll did not and did the payment manually immediately after discovering this,please can someone assist me tried calling the 082 135 number numerous times and tobi just doesnt transfer me to an actual agent who can assist me