Phone still not working after 4 months!

Recently upgraded my contract to a Samsung S6 edge. This was done on 1 June. after 7 days, struggling with the phone freezing, and having NO network, I returned the phone. Vodacom DID NOT exchange the phone with a new one, as they should have. <br> Instead, they sent the phone away for repairs. Phone came back. It was tested IN STORE, and was still broken.<br> Phone was sent in for repairs a second and a 3rd time, each time coming back, still broken. The phone went in for a 4th time on 31 July. Almost 6 weeks later, and still no feedback even<br> <br> It is almost 4 months now, that im paying for a broken device! I do not understand why the phone was not exchanged. Instead, Im paying for something I cannot use. I am paying for almost 4 months for the device, and have not had it for longer than 1 week in total!<br> <br> Worst after service ever! Looks like vodacom is NOT the network to be with after all. So vodacom is failing to deliver a service, and then also refuses to cancel the contract without a cancellation fee.