Worse Customer Experience

@MobilePlusSa & MTN South Africa I took out a contract in the period of August/Septmber this was a sim only deal. I was advise that at any time during this contract I could add a device, no costs would have been incured. You can cancel your contract at anytime at no cost. I was happy enough to sign up. During the month of October I asked to add a device and was told that I will need to pay for an upgrade fee. 15 days later I am still sturggling to get an upgrade done because the people at this entity does not know what they are doing. I have called in since the 5th of October asking when this would happen I was advise 5 days, guess what its day 15 and nothing has been done. This morning I called in to ask if I could go into the store and do an upgrade. I was advise yes. Well looking like an idiot I was told that I can do an upgrade due to this cancellation. I called again now and the guy says that MTN has a pending issue. So why tell the customer that he can go into a store and get a upgrade done because the cancellation was reversed. I am highly annoyed and I cant do anything about this. Best advise that is given on calling both Mobile Plus and MTN Mobile Plus - " The problem is sitting with MTN MTN - The issue is with Mobile Plus Nice blame game and customer service.