Vodacom complaint

I want to share with you all today I am so disappointed with vodacom, I do in store payments so in December I went to the store to make payment as usual, when I get to the consultant they inform me my account is in credit, shocked to hear this I insist they check again stating that i did not make any additional payments they assured me i will not have to make a payment as it's not a mistake i even received a statement stating the same amount that was in credit so after 3 months i received a statement that my account is behind on payment that i had 5 days to make payment after asking them to check several times in December and again in January and all they have to say today is that there was a payment that was misplaced and had to be rectified. This is shocking honestly