Unacceptable Service

I have been overcharged on a contract which was initially R249,and eventually changed my package to a top up.I have spoke to Nobisa who could not understand me and transferred me to her team leader Glenda,after explaining to the team leader my problem and sending numerous documents to her she said she could see I was being billed correctly for the 1st 6 months but once the migration was done I was billed extra, it was escalated to accounts department.<br> Zanele called and told me the same things, she informed me that she could only put me back onto the previous package I was on and the money which has been paid cannot be refunded.She said that I was paying R249 for a 1gig and R170 for the device, how is it possible to pay R249 for a 1gig when it is actually R149.<br> I don't understand how I can be billed extra when I was not informed of the change in price, I want to see documents that gave them permission to deduct extra money from my account or the recordings of the call stating that I will need to pay extra.<br> I have 3 contracts with Vodacom but I am highly disappointed with the service and turnaround time which I am receiving from the call centre.....