Why can't I port back to vodacom?

I app**** for a contract phone at game with vodacom. I told them to use my existing number as vodacom promised to port it back by the 12 Sataday 2016. Today is the 14th today and vodacom tells me my number doesn't exist. I have got the sms indicating my number will be ported 12 March 2016. Today I put the new sim card I used for porting and I get a new number. My sim has not been activated, and I was told to wait another 7days before porting back. I last ported out to cell c on the 12 december and its been 3 months already so I don't know what's taking them so long. So now vodacom will be debiting my account on a sim that is not registered? This is not acceptable. Somebody assist me before I cancel this contract. My old number is *** that I want back from vodacom.