credit limmit

My account has been locked due to the credit limit, even though my account is up to date I have phoned the customer care and account department a grand total of 22 time. Various consultants have promised me to unlock my line 3 days later my phone is still locked. last month my phone was locked for a quarter of the month but Vodacom is still charged me for the full month. This feels a lot like theft to me.