Neglecting to close account

I request a settlement from African Bank on Wednesday 13 February 2018. I received the settlement letter and paid according to the settlement amount. I forwarded the proof of payment to ********** and subsequently phoned in the next day as I logged in and amount was reflecting. I spoke to a certain Jeffson and he ensured me that the account is fully paid up and will proceed to close account reference ********** . Received the following message

Hi MRS L PRINSLOO. We are sorry we cannot complete your request with your account closure because of Account Has not Been paid in full for Acc Ref ********** 4665. Here is your reference number - ********** . If you have any questions feel free to call us on ***or visit your nearest branch. African Bank Auth. FSP Reg NCRCP7638 RDC91017/16

I phoned in and enquired what the reason was and the consultant Jeanine indicated that on her side the account is fully paid and could not provide me with a reason. I asked for the supervisor Lesego and he assured me that he will close the account and personally phone me back once done. Today I receive another message indicating the following

Hi MRS L PRINSLOO. We are sorry we cannot complete your request with your account closure because of Account was closed for Acc Ref ********** 4665. Here is your reference number - ********** . If you have any questions feel free to call us on ***or visit your nearest branch. African Bank Auth. FSP Reg NCRCP7638 RDC91017/16.

I am so frustrated and is wasting my airtime to phone African Bank to resolve this. This is unacceptable service to be receiving as a client. !!!!!