Vodacom gives incorrect information information and is contradictery

Good day I am a loyal client of Vodacom for 21 years. I would like to lay a complaint against the upgrades department at Vodacom , I have done an upgrade on the 20/12/16. the consultant who assisted me over the phone stated that my monthly subscription would be R699.00 fixed amount for the duration of my contract and that I would still be able to make my calls as per usual. However ,since my upgrade I have had an issue with the new package have been given. My package now gets depleted where in the past I was able to call as much as I needed to and pay for whatever I've used. When trying to solve the problem I was advised to do a migration which will solve the problem, but the monthly subscription now goes up to R900 which exceeds the amount that I was initially promised. I have been struggling for the past few months trying to rectify this issue, please can Vodacom contact me with a solution.Thank you.