Extremely Disappointed

I did an upgrade + fair enough got the phone but speaker doesn't work. And can hardly hear the person on the other end and when on loudspeaker the person on the other end don't hear me. Within 3 days of getting the phone I call Vodacom to tell them, I wasn't sent to pillar to post. Was advised they will collect the phone on the 4th of March, I call them just to confirm whether they are still coming only to be told it hasn't been scheduled for collection I must call again next week. Then I ask them to cancel the contract because was advised I can cancel within 14 days of receiving the phone. They tell me stories that I can't return the phone as I'm still using it. So I switched it off and haven't had a phone since Friday mid morning. Fine at the same breath I'm told they will contact me, where I don't know as I was asked to not use the phone. The new phone uses Nino sim card and old phone uses Macro sim. So because I had done a sim swop old phone is useless to me. I've sent a couple of Twitter messages as well no one wants to talk or advise the way forward. I Just want to know when are they collecting their phone. Contract gonna be cancelled and its fine they can keep my airtime....