billed for no service

On 11 January 2018 my WiFi went down. The next day (12 January 2018) I reported a fault online received ref nr 44317. Since then I still don't have service. I recieved an account for the full installment even though I didn't use the service for 3 weeks! I kept checking the fault online, and saw that they amended my initial fault now stating the fault was logged 27 January 2018 (ref 46146). I've called various times and the agents only say "the line has been damaged or ****** they are working to have the line repaired" but the "workers" sit around cchatting most of the time. I ofter drive by where they are "working" on the line. They have a little gazebo set up there with chairs and drinking coldrinks and chatting. very "hard work". I asked if i will be referunded for paying the full amount without service. The agent said i must take that up with accounts. I phoned accounts to cancell the contract. she gave me nr to phone 081 180 - not working. Tried to phone 010210 again, kept holding on until all my airtime was up!! Data is costing me a fortune ON TOP of paying the monthly bill!. I want this contract cancelled ASAP! giving 1 month notice with no payment in lieu of paying for a month of NO SERVICE!