Account softlock

I took out a new contract with Vodacom on the 16th of December 2017, ever since the 4th of January 2018 I'm already having problems with them. My account (I ********** ) is for some reason on a softlock, this is occurring now for the 3rd time in a period of 13 days. When the account is on a softlock I cannot make any outgoing calls, send an SMS nor access the internet, the only number I can call is 100.

The message that I'm receiving before the lock says "Balance has now been exceeded. Line is softlocked.". I'm on a Flexi plan so there is no way I can exceed my limit, because after my minutes run out I have to top-up myself.

First time this happened after speaking to the 3rd agent he managed to unlock the account within 5min but sadly it happened again after a few hours, second time spoke to 5 different agents each giving me a different reason to why this is happening (which I still don't understand), and said they have to escalate the issue and it will take 48 - 72 hours to be fixed, I waited 4 days. Now the same problem is happening again for the 3rd time and I'm getting annoyed.

How long will I have to wait now, and until when will I encounter the same problem?