unfair and incorrect credit score

On the 16/01/21 I sent an email to vodcom customer care regarding a query I had, after 3 weeks i sill did not receive feedback. Today I sent a follow up mail and was contacted by one of the agents... I was retrenched last year and requested a deactivation of my debit order and since then ive been paying on the date I receive my statement. I receive my statement between the 3rd and the10th and immediately pay the statement amount, which means im paying before the payment is due ( current) every month I get my credit report and noticed that im being listed as a slow payer! The collections department explained that my account is up to date but im being listed for a "short payment" of R17... My statement and invoice amounts differ by a few rand. I was informed that because im choosing pay the lesser amount Im being listed. this makes no sense that the invoice and statement amounts are different? I pay the statement amount and not invoice amount and its now affecting my credit score and is affecting my chances of getting a job!!! This is not my fault. I would like for Vodacom to look into this and rectify because this is not my fault …. I PAY MY ACCOUNT ON TIME