Locking lines with no outstanding accounts

This morning I wanted to make a phone call and heard that my account has been locked. When I called in the consultant checked and couldn't understand why it was locked as I have no outstanding account, she then sent an email for it to be unlocked. A few hours later it was still locked, I called again and was put through to the billing dept, they also confirmed I have no outstanding account and it would be unlocked within an hour. 3 hours later I had to call them again, my line has been unlocked but the simcard in these new Telkom phones is still blocked. Telkom is absolutely pathetic, how do you lock a line that has no outstanding account!!!!!!!!!!!! This has now been a full day of struggling with them to get my phone unlocked that they locked for no reason to begin with.