Worst Customer Service EVER

I recently got a new contract IM from them, and from the first day, I was unable to make and receive calls. I used another phone to call the customer service centre to try and get it sorted. This did not help... they gave me a bunch of USSD codes to call from my phone and eventually just told me they can't help. I phoned again today to see if a different person can help me, but she referred me to a Telkom outlet because according to her everything seems fine on their system and that the SIM might be faulty. I am getting different stories from different people. It is very important that my calling gets activated as I am going on a trip in a few days and I cannot be without a phone to call. I'm seriously regretting ever switching to Telkom Mobile.