Vodacom - From good service, to terrible service with no resolutions!

Two weeks ago I app**** online for a device and to upgrade from prepaid to contract. After a week I called to find out what was happening as I was advised it was approved. Only to find out they apparently could not get hold of me so they cancelled it. Even though they put my cell number and work number in the notes, they advised there confirmations department doesn't see the notes... what a waste of time. They assisted and sorted it out within 24 hours and I received my device on the 01/10. Then I had the issue of speaking to so many people just to get it activated. The agreement was R519.00 per month, and I see on my current statement they are billing me twice for line rental, total bill to date R798.71. I have also not received any notification about the R10 000.00 Top Dog Educational voucher I am supposed to receive with the package. I have spoken to so many people in so many departments and I am not getting any resolutions. I am so sick and tired of always having to answer the same security questions over and over again. When I was on prepaid I was a very happy customer, now that I have moved to contract, I am not getting anywhere with Vodacom and actually feel like telling them to cancel the contract and return the device. On top of that, their online chat is never available and to query my account I received a mail to use the VVM Online Portal which doesn't work. I am so frustrated and disappointed in the terrible service from Vodacom.