Close of the account

Dear Sir\Madam,

Kindly assist me I have an Ackerman's account. which I paid in full on the 30/03/2019, I send an email to them directly advising them to close my account since it is paid in full, I had to make a call for record purpose spoke to Thandi agent who refused to give me surname she was not so helpful. I then requested to speak to the manager Mthebekeni Mungeka who then advise me to send proof payment which I did, however, he advised me then should my payment not reflect within 4/5 working days and statement for the next month April 10/2019 will be sent which I will be charged R 17.50 monthly fee. I feel it is not fair for him as a team leader to advise me on that, he was supposed to say "I will do my best that your payment will be allocated from the correct department so that we can close the account" and make effort and means that my proof of email gets to the correct department to allocate my payment. I do not want to make any monthly fee because he advises that I will still be charged if my account my payment is not reflecting or allocated but I have sent proof of payment. I need assistance urgently.