Vodacom suspend account although it has been paid

We have two accounts - both was paid at Checkers Money Market on 2 August 2018. I received a sms from Vodacom saying payment was received and no proof of payment was needed. However the cellphone users on the one account kept receiving automated calls that the account is in arrears. On Thursday 23 August 2018 I called the account department. The consultant confirmed this account was in fact paid and was not in arrears. She said the other account was in arrears, but we have not received any notice. I explained both accounts has been paid and I send the slips. Today, 27 August 2018 I called the account department again and send the proof of payment again. This evening the cellphones on the account that was supposed to be in arrears, but was not, has been suspended. This is so frustrating!