MTN commits *****

I opened a new contract with MTN and my iPhone was delivered last week Thursday (16 April). I was not able to activate the phone as it was already linked to another person's Apple ID account. This means that MTN sent me a second-hand/****** iPhone. This is absolutely shocking. MTN has also been very slow to reply and solve the problem. I reported this immediately (within an hour of receiving the iPhone) but the phone was only picked up on Friday afternoon and I was promised a new phone by 'latest' Saturday (18 April). I phoned MTN this morning and apparently they can't tell me when I'll receive a new phone (because the old iPhone is still in Cape Town and needs to be flown to Jo'Burg). This is the worst service I've ever received from a company and no one within the company seems to be willing to help me.