Worst Service

Went to the Cell C Store in East Rand Mall on the 19th of March, wanted to upgrade to the new I-Phone, I was told by the lady behind the counter they have no I-phone deals. Received a call from Cell C Telesales, told them I wanted to upgrade, was told it's not his department. Received another Telesales call on the 29th of March, the lady upgraded me and said I should have the phone in 5-8 days. Three weeks later I phoned and no one can tell me where my upgrade is. I speak to cancellations department, and is told some will phone me back in a day or two, now it has been more than a week and still no assistance. Don't know what to do to to get any type o service from Cell C, utterly disgusted.