Dishonest service incorrect advice

I have been experiencing great difficulty with Vodocom and I am still having the same problem now. I had made payment in full to Vodocom via bank deposit for my arrears and outstanding balance owed to Vodocom this was in 2012 / 2013 & I have proof of last deposit payment in 2014. I'm very disappointed since the Vodocom accounts gave me incorrect information from the very first call I had made. I had asked for my total amount in full on my account. After paying the amount given by Vodocom I had received a call from Vodocom to make payment on the handset. I was upset & I was told to pay every month towards the handset. After a few months i had managed to pay the full amount. I called Vodocom & asked for full balance total on the handset which was 1600 & Vodocom gave a Ref acc 1623. I had made that deposit on the 01 /04/2014 How ever On the 26/04/2014. I received legal notice from Munnik bassoon Dagama debt collector saying I owe1879.87. Now I've been handed to VVM and its 2016 I sent proof of payment & they have been phoning me every day and harassing me to make payment. Today 21/04/16 a consultunt rudely told me I owe Vodocom & i have already e mail proof of payment to VVM.