Wrong contracts created arrears created off phones

In December 2014 I was 4 times in Autopage Centurion to get my options for my upgrades. Last 2 times with Hendrik - I made it clear that I want TopUps with MTN. At that time before upgrade, my topups was on CelC network - 200min, 200sms and 200MG. I asked for the same with MTN. He confirmed it can be done. With my upgrade I signed on 8 January 2015 - 3rd time at Hendrik. Confirmed again the top up 200sms, min, MG. He printed the contracts and advised sign here, sign here, etc, I signed - I was clear I wanted top ups. On 16 January problem with one phone and I went to Auto page.I asked where can I see how many minutes, sms and data on phone left. Found out that I have open lines and not top up. Jane advised MTN does not have the top up package as I requested. In FEB she changed my package to top up 200min,100sms,300MB. Autopage want me to pay half of arrears that generated in Jan with wrong contracts. I refused. phones cut of regularly. I pay for top ups as I should have in the first instance. Auto page still want me to pay the arrears of R1271.00. I still refuse. I was mislead. Mtn anytime 200 and mtn anytime 200 top up sounds very close. Hendrik knew what he was doing.