Cell C service delivery is terrible

I upgraded my contract with Cell C and my new phone was delivered on the 03/07/2015. My old phone takes a mirco-sim card so I had to call Cell C to port my number as the new phone takes a nano-sim card. I was told that the porting department only works Monday to Friday 8am-5pm, they logged a query, reference number *** the agent said someone will call me back. I've been calling the call centre on numerous occasions and each time was told to wait for an agent to call me back. On Friday 10/07/2015 I called again and received another reference number ***. I did not expect such poor service from Cell C who are offering to buy people's contracts from other service providers and they cant take care of their existing customers.