failure to deliver a service

Me and my fiance tried to upgrade a phone through vodashop on line. Vodacom then send us a new phone and a new contract and number. We then tried to do a swim swop like they said we must do. Vodacom informed us then that this cant be done as the new line is already activated. They said they will do an investigation and phone us back. It has been 2 weeks now. We then went to our nearest branch they said that we must phone Vodacom online and stop both contracts then come to the shop and do an upgrade. We have phoned Vodacom online everyday since then, 11 times a day. Everyone said they can help us they will phone us back in an hour. We still have not received a phone call. We still have 2 phones, 2 contracts. The best thing is that every time I phone 082111 Vodacom puts the phone down in my ear after they greeted. We can't take this anymore. The consultants are rude and does not even tried to help us.