Useless MNO regretting switching mobile networks

No one is able to assist me with my query , i am being transferred to every department. It seems no one at mtn "customer care" aka customer don't care are able to assist me on their very own network. I ported my number from vodacom to mtn, requested via mondo for a device and a sim card. Asked that my ported number be my number for life and the new contract. Was told upon receiving my new sim and device, i should not insert it into the device and call customer care and they should do the SWITCH. Eventually after some struggle got hold of the activation department was told the process takes two weeks to activate and my one sim card will stop working .This is about more than 2 weeks ago and still nothing. I called MTN this morning ref *** to find out whats happening and got told i should take it up with MONDO ref 20LLP8J than i called mondo and they told me MTN must do it as they don't have the capabilities to do it.