******** suspending

I took a contract on Telkom mobile on October 2015 they said they don't charge any cost for the 1st month but the second month you have to pay dubbel I agree.. November came and payment was made of 1040 then Desember came and I had a bill of 1877 on a contract that has to cost only 399 a month.. Januarie 2016 came and I had to pay a amount of 713.70 I payed it on the 20th Jan 2016 my phone gets suspended and when I call Telkom they tell me I have a amount outstanding of 889... I don't know where that amount comes from but my phone will be suspended till payment has been made... I find this matter wrong and there is nothing done to fix it .. I have 3.5 gig and a 100 minutes I already paid for but its suspended I have school assignments to complete and now it can't be done thanks to Telkom