pathetic service with no feed back after 8 months

in 2017 i opened an adsl uncapped account with telkom after waiting two weeks for instalation it work perfect. on 1 december 2017 my wifi broke down and i logged a call with them the same day eventually on 8 febuary 2018 the technitian came to fix my line only to work for two weeks. i stopped payment end of december as why should i pay for something i cant use.on the 21 feb 2018 it broke down again i called again and ligged a call again up on till today i had no feedback from telkom but they kept sending me invoices every month bringing my account upto r6000 now.on the 18 july i called again to get the account sorted and calls was logged again.i sighned a 24 month contract i feel that telkom is in breach of contract and that is the reason why i stopped payment. now i must wait another 14 days as a call was logged again refrence numbers ********** 7, ********** 3 , ********** 7 , ********** 4, ********** 6 , ********** 7 , ********** 1 , ********** they want to credit me r100 or r200 per month but why should i pay for something i havent used for 8 months