Disappointing new service and want line cancelled!!

I enquired with Telkom for uncapped wifi which was R605 per month and to have a lit box was R50 extra. I eventually received a courier delivery on the 14th August which was the lit box but at this time no line was installed. Line was installed on the 6th September upon which I was informed by the Technician I needed to contact Telkom for the username and password. I received the username and password but when the technician tried to activate it would not accept and I had to call in again which I then received username and password on the 8th September...since this day the wifi has been sooooo slow...our coverage is so bad we cannot even open a website without it taking a few minutes....couldnt use the lit box at all as coverage was so bad.....now I get a bill from Telkom charging me pro rata from the 14th August when I didnt even have any use of this service. I have been in and out of the Telkom branch Pinelands and they assisted me and also referred me to contact 10210. This entire month I have been walking up and down and I am getting no pleasure from this....I want this line cancelled with immediate affect as I dont see why I should pay for such a badd and terrible service since day 1 and pay over R1000 for nothing!!!!!!!

So please just cancel this line and do not deduct this first instalment as this would just be rip-off.