Ripping me off

My fianc? & I app**** for a 4MB ADSL line as well as a telkom phone line and not use them as service provider. We asked all the necessary questions like how much will it cost, is there any once off fees and do we pay installation. We had to pay a deposit of R700 and we paid it. According to the sales person, there was no charge for installation. Eventually about 8 months later our lines were installed. Then on 31 Dec i get debited R2299.26. Which was absolutely a shock to me. Apparently telkom had charged me installation which we were told we wouldn't have to pay. So i disputed the debit order at the bank. The bank reversed the debit order and i went to our nearest branch and queried the amount. I ended up paying only R1100 as i felt that i should only pay for services i thought i was getting. I disputed the installation fees which were 2 seperate amounts. Telkom apparently reversed the one amount. Now this month i get debited R2028.90?? *** Telkom. Oh and by the way,, you people have been billing me for a 10MB line, which is also NOT what i signed up for. This needs to stop right now.