Over charge us

We have reported a billing problem a week ago with above reference number.<br> When we called they couldnt or wouldnt help us to resolve the matter and said someone will call to Discuss this.<br> Today we received an sms stating the problem has been resolved. NOT TRUE<br> We called you call centre again holding on for 18mins I spoke to 3 people explaining the problem. Obviously your staff lack the training to be able to help.<br> Date Your invoice I paid<br> Dec 2014 2864 2864<br> Jan 2015 2044 2044<br> Feb 79 1000<br> Mar 838CR 1000<br> Apr 2245 2245<br> Mei 92 1000<br> Jun 824CR 1000<br> Jul 3520 3520<br> Aug 98 ?<br> TOTAL 9280 14673<br> As you can see you invoiced me R9280 and I have paid R14673 so our account should me in advance with R5393. Business is tough in December we have to pay Bonuses and leave pay and its not a busy period for us. We are trying to fall back on our advance when we need it.<br> Please explain to me as a matter of urgent