credit limit bar lock

The worst service provider I cannot believe this,i have been with Vodacom for years even worked for them now im having such issues I feel like cancelling all 6 contracts that I have,since last week Friday I have been having issues as they lock my account every single day after 6pm,i then need to call in every single day for them to try and sort it out and all they do is unlock the line for a day then lock it again after 6pm,they keep telling me problem has been sorted the credit limit bar has been deactivated but im having the same problem all the time,i don't see why I should call in every single day to have this issue sorted it wastes my time and my energy holding on the line all the time being transferred from call centre to call centre each time,i pay Vodacom each month R2400.00 and have many lines with them I just feel like cancelling all my lines and moving to prepaid as I don't even work anymore but still manage to pay Vodacom R2400.00 each month but get treated like this. So pathetic I just want this issue to be resolved or im going to cancel all my lines and not recommend Vodacom to anyone.