Shocking service

A couple of months ago I had to take my LG in for repairs which I took into the Brooklyn Branch. Whilst my phone was in I had to use my old Blackberry so I bought myself R100-00 airtime via internet banking and then I phoned Cell C and asked them to activate it. After I received my LG back I no longer had the need for the BIS bundle, however Cell C had taken it upon themselves to increase my debit order from R308-00 per month to R365-00 for which I was not consulted. I have been phoning them every month now for 3 months and they keep telling me it was cancelled and I am supposed to get a refund. Imagine my surprise when I received a notification from the bank today telling me that they have taken it off yet again. So now I need 4 months refund. This also threw me into overdraft and I have incurred bank charges of R90-00. When I phoned in I was told that this is a recurring thing. To make things even worse is my phone is in yet again for repairs, this time at the Menlyn Branch. This is the most shocking service I have ever had. I would like a refund for all these months as well as a refund on my bank charges. I will also most certainly never ever recommend Cell C.