Disgusting service

Weve been without wifi since the 5th if January...11days!!!! Logged numerous calls after being on the phone over 3 hours just to find out that they decided its not a real problem and closed the cases. Were still without connection and still being billed. Ref no ********** 4099 ********** 5 114atk050118 236atk150118. No one contacts us and up till today no teqnician. How do we go about to cancell with Telkom. Will NEVER promote them to anyone.