Upgraded my line then suspended my account

I wanted to upgrade to a faster line.<br> I payed up my account that was in the rears and asked to increase my limit to R1000 so it can never be in the rears again.<br> <br> They told me it is paid in full and I can upgrade. I asked for the upgrade and it went thru but I have to wait 72 hours. I waited and they disconnected my line. When 'n phoned them that say I owe them -R900...... That is les than my limit!!!<br> <br> Now I have to phone them be on the phone for 10min to rectify a problem that shouldn't be there.