Fed up

I ordered Fibre then cancelled it before Telkom came to install it. I cancelled it for a line. When they came to install it they installed the wrong thing. They installed the fiber that I cancelled, i phoned before they installed it, a week into them installing and even went to the branch to cancell it and they cancelled it only after 3 months. I'm being charged with the 3 months of internet that I cancelled before it was installed. They charging me for the whole 3 months, they haven't provided me with proof of usage or the calls that I made cancelling it before they installed it. They've reported me to the credit bureaus. The only proof Telkom has that I "used" the internet that they wrongfully installed that they charging me for is that I logged in, the company that installed me asked me to check if it's working by logging in to it. They haven't provided me with any way of verifying it on my side, if it true or false. Telkom is the worst. I'll never use it again.