Locked Sim

I have a contract with Vodacom and requested a call limit over my normal spend. I reached this yesterday and now Vodacom has locked me out, I still have free sms's as well as data that I cannot use, all I advised them to do is put a limit on my calling and not block me out completely. what's worse is I called the call centre yesterday and after 16mins of holding on I had to eventually disconnect the call because no one was picking up to assist me. Wrst service ever.