Vodacom seems to be swindling me for money

I have never experienced a company that does not know whats going on with their clients accounts, how do you run a business in this manner? <br> <br> i received an email on the 11 November 2013 stating my balance and the discount, I have been paying without failure since 26/11/2013 however when i queried my balance on the 20/01/2016 I was told that I still owe R7000.00 for the contract value. according to the information below I should only owe R770.00 but i think Vodacom does not keep proper record of their clients information. I have proof of payment and I do not think this is fair as firstly I was paying for something i didn't even utilize but because vodacom couldn't prove it I didn't want to risk being blacklisted:<br> <br> Total: R25099.25 <br> PS: Please note that Vodacom has offered you a 30% discount and will accept an instalment of R700.00 as of 26.11.2013 until it adds up to R17570.00. <br>