Irritating sms notifications for acc which is paid

When adding my account as an beneficiary we made a mistake with the ref nr. With the creation we also added the email they gave us, [Email Removed] so everytime we pay the proof will be sent automatically. The payment was done on 4/3. After numerous sms's and calls to pay my account i was told to mail the proof of payment to [Email Removed] which i did on the 27/3. Roughly 20min after sending it, we received an automated receipt confirmation (10:53am), where after we thought that it was settled. Again the sms's came and again we told the agents that the proof was sent, we even went to the branch, middelburg, on the 5th april in hoping to sort this out, but the lady told us just to email en keep on phoning. We cannot keep on phoning since money dont grow on trees for us to keep recharging our cell accounts. Why cant the agents just check the emails and rectify the account immediately?