Vodacom Accounts department Incompetence

I have been paying my Vodacom account every month without fail on time. They have listed me twice on the credit bureau saying my account is in arrears which has impacted my credit score at the credit bureaus. I have proof of payments for all the months. And what is weird, is that I just upgraded my contract. How can they give me a new contract if my account is in arrears. I am appalled at this treatment. I have a fibre account with Vodacom that is way more than the measly phone contract and that is up to date, how can it make sense that I would not pay up my phone contract. Is this the service I can look forward to???