Exhorbitant phone bill

I phone 10210 on my Telkom landline to complain about the charges on my phone bill, I am normally charged R200 on my bill, the only thing different that I did was change my ISP service provider from Afrihost to Telkom, and where I used to pay Afrihost R375, I now have to cough up R600, my bill is now R800. Why am I using Hellopeter to complain, like I said I phone 10210, voice prompt, pressed 2, then 1, the response on the other side, your line is suspended due to arrears on your bill, goodbye, my line is still active.My biggest mistake was changing from Afrihost.