Upgrade at a HIGH cost!

I went to the telkom store on Adderley Street to ask them to upgrade my calling plan from Smartplan 50 to smartplan 100. I asked how much it would cost and was advised an extra R50 a month. They said they would call me before they did it to confirm... Did i get a call? NOPE. Then a few days later i realized that i had a lot of extra minutes so i phone the call center and asked if they had changed it. They said yes but couldn't confirm anything as the system was down. I was promised a call back but again nothing. Last week i get my bill which is usually about R700. This month it was R1398! I phoned the call center and they said there are migration fees which i knew nothing about! also the bill was so confusing not even the agent knew what was going on! They opened a case and I am still awaiting a response.