Upgrade on Contracts

I called Cell C Customer Centre this morning and I waited for 20 minutes before someone could assist me.After waiting for such a long time I was then transferred to three more people.At the end of the day I just felt its like they are doing me a favor to have contract with Cell C.<br> <br> I had upgraded one of my contract with Cell C, and received the cell phone yesterday (01/12/2015).<br> I wanted to swap the upgraded with my other contract and cancel the one contract.But I was told that they`ll have to collect the phone in 7 days and send for couple of days for assessment.Thereafter I`ll then be able to cancel my other contract with them.<br> <br> I am disappointed because I have a customer for 7 years now,