I am being overcharged for my cellphone account.

I am currently being overcharged for my cellphone contract. I was paying R499 at Nashua Mobile( Previous supplier) and currently paying the amount of R628 at Autopage. The staff at Autopage (especially at Head office) has been very unhelpful and been trying to rectify and complain since the beginning of 2015, but with no avail.<br> <br> According to Autopage Im supposed to pay R220 (incl vat ) for my straight up-top 200 subscription and R299 for my device which amounts to R519 in total, I am currently paying R329 (incl vat) for my subscription and R299 for my device so it amounts to R628.<br> <br> When trying to rectify and logging numerous disputes, they say that I am paying the correct amount, and that it is the Amount that I paid at Nashua Mobile.<br> I logged another query with Dehapi on the 17/08/2015 with Ref number: 811751, and sent my contract to them that I had with Nashua Mobile, and was given 5-7 working days. I dont want to wait any longer, I just want my account sorted, as I've been overcharged since December 2014.<br>