phone line cut despite payment made

hi there,<br> i received an sms stating i owed an outstanding balance of R450, i did pay this 2 days ago, despite doing so, this morning i get an sms telling me my line has been cancelled and i need to pay R965.68???? Firstly how does the outstanding amount almost double and secondly, i have made my payments and this month was not an easy month i still made the outstanding payment but i still had my line cut. this isnt fair at all. please could someone rectify this situation?<br> my other alternative if this cannot be resolved is to move over to iburst like everyone tells me to so i do not have to deal with telkom anymore. thank you.