Bad bad service received from Vodacom after being loyal to them for more than 2 years

I'm very disappointed with bad service I received from vodacom, after paying my account every month but according to them, my account is in arrears for 179 which according to them was short paid in November 2020. This I affecting my credit score. I sent an email with my bank statements to *** on the 21st of January as a proof that I paid full amount end November 2020, I don't know why they say I paid short. After sending my proof of payment, Vodacom rep**** with an SMS saying they received my proof of payment and my account has been rectified.

I was shocked this morning when I called Vodacom customer service, wanted to upgrade. I found out that my account is in arrears for 179 that was short paid in November 2020. This means Vodacom **** to me when they sent SMS saying my account was rectified after proving that the fault was on their side, I never owe them.