Vodacom! Work on your customer service

I am a good longstanding customer with vodacom and clearly this holds no ground. On Sunday vodacom made a call to block my number without informing me. My account it up to date and there are no issues ,so why block my number and not inform me?. So after several calls to vodacom and still now...it going into Wednesday...my number is still blocked??????? Why???? I have missed several important calls and messages. Please explain? As usual Vodacom disappoints. Takes the money but disappoints. If my account is up to date...why? I'm interested to see if they bother to respond