New number with upgrade?

Hello,<br> <br> I upgraded my contract now in March, as I was due for an upgrade. I received a new phone as well as a new SIM card. When I inquired about the SIM I was told that I don't have to use it. Now, on the last day of the month I cant make any outgoing calls and I cant log onto my Vodacom account online. I called customer care and my call was cut off twice. I requested Vodacom to call me back and received a few calls which I presume was Vodacom, however, when I answered there was no response/sound from the other side. I can only presume that I received the SIM because my new contract is on a new number. I did an upgrade and my number should have stayed the same. However, this does not seem to be the case. <br> <br> Regards,<br> Nico Dreyer