Telkom fix my Account

I paid my account for a newly connected adsl package via eft. I did not realise that the eft reference was for my old line. I since called them more than 3 x to correctly allocate my payment, but they just keep saying they will log a dispute with the Billing department as my payment had been labelled as a Deposit.. What the ****ens is a deposit??! When I pay Telkom it is for the account which I have with them..All the agents I spoke to have acknowledged that my payment WAS received, but has been allocated as a 'Deposit', hence my new invoice still indicates that I owe said amount?! So far nothing has been corrected and I see that my November invoice includes October's amount which I did pay. Doesnt your book-keepers know how to correct it? My payment was for my account as per my October invoice ********** 369. Which means I am up to date with my account. I now owe Telkom only for November.