Such incompetence MTN

I recently upgraded my contract with MTN, took a tablet. Now the lady who was assisting me with the upgrade gave me a number to call for activating my number ***). I've called this number a million times already, I entered my id and sim card number then the prompt says there is a network issue. I've also called the 808 dept for number of times yesterday, the one lady transferred me to the activations line that I just explained above. The last lady said everything was sorted on their side, I checked my device last night, no signal.I called again this morning & spoke to Ndivhuwo who advised that my sim number had not be mapped correctly.She then asked me to call them after 3 hours,I told her that I've done enough calling they should call me.She told me that they could not call me back,I told her to get her superior to do something about this.If I do not get help,I am going to return this device( I still have 7 days) & wait for the expiry date of my contract and leave MTN.This is utter incompetence & so very unaccepted.