Accounts and website in a mess

I had a credit of R600+ in my account which has dissapeared and I can't get an answer as to what happened to it. The staff blame the new system and say it will be sorted out. In the meantime, I will be in arrears and run the risk of having my service cut off tomorrow. Do I pay in more to prevent that and risk losing that credit as well? On the website, the facility to activate/deactivate my holiday decoder is not functional in spite of saying that it is. There are also other issues with links on the webpage doing unexpected things (on IE and Google Chrome). Surely they test these things before going public?