I had settle an account

I wanted to settle my Vodacom account I called them I received a Premature cancellation quotation wghich was included in the calcellation discount which brought the final total to R1229.23 which must be paid in the next 12 days which I went to pay it the 20/10/2017 and I called and received the quote the 19/10/2017 when I got to the store to pay the aacount the consultant told me I should make a payment of an extra 43.00 which was an outstanding amount on the account which I paid and the grant total was R1272.23 and account was on 0.00 30 days later when I call for my cancellations and settled paid up letter they advise me that there is still a balance of R37.26 heloooooo were does that balance come from now if I was told and confirmed in my face the balance is 0.00 am so furious and for a fine chick the person that assist me in the call Centre don't feel like talking to me puts her headset on the desk an am holding onda line so uncallful I have worked in a call Centre I know exactly that is against there policy when I asked for a manager I was put on hold for a 15minutes then told manager not available because they are scare for that exculation. I have proof of my payments and the quotation they send me.