The worst service provider in the whole of Gauteng

I have been with Telkom for the last 2 years , my bill is suppose to be R500 yet I keep getting a bill of R800 every single month ! I do not have my house phone connected so there is no way that my bill will be that price. The people at Telkom cannot provide me with a logical reason as to why the bill is higher and the more I have explained to them that my phone is not connected I just use my wifi the more they fail to understand. I have been going back and fourth with them regarding this issue !!! The service is disgusting and they have no respect for any one !!! I pay my bills every single month yet I still have no WIFI my business runs off the internet !!! I pay for my service yet I have received nothing but POOR and DISRESPECTFUL service in return !!!! They refuse to even explain to me why the bill is higher and they have now cute my WIFI because I did not pay the additional R200 ! I will not pay this bill because this is not the fee I agreed on in my contract and if there is no valid reason to prove that I should pay this amount then why the **** are they cutting my service !!! MY BILLS ARE PAID !!!