Accounts / Customer Service

I received a few sms's from Vodacom stating i could upgrade 1 Nov 2015. I then went to Vodacom shop Festival Mall 1 Nov 2015 to finally upgrade my Lg G2 to a LG G4. The sales person who actually helped me stated on the signed document the contract to be R450.00 per month not saying anything about double handset fee's. I then received my bill today seeing that they charge me 2x 24 Month Handset Instalment. How do they charge for something that is no longer in use if you upgrade to another handset which is suppose to replace the existing handset? this is ridiculous. If I knew this I would rather have let my contract run out with vodacom and cancel the contract and then went with MTN instead. This is ridiculous and they are *****ing people's money to pay double for 2 handsets not saying anything to their customers! why would i want to pay for 2 handsets I'd rather have waited till the 24months were over to upgrade then!!! never has this happened to us now all of a sudden you pay for 2 handsets!!! Ridiculous and when i told the online chat accounts consultant that i would be taking this further they kicked me out of the chat absolutely PATHETIC whoever this cmc10 is...