Shame on you Telkom

Does anyone at Telkom care about their customers. Our telephone line has crossed with another line so no phone or Internet and both my son and I work from home. I reported the fault on May 25 (fault 268CRK250515) which they then cancelled inadvertently before restoring the complaint. Long story. Yesterday they promised a technician was on his way. Today they say it shows that he has come. He hasn't. Now he's on leave and they promise to assign someone else and call me back (on my cell). No prizes for guessing that there's been no feedback. What are customers meant to do. The call centre staff are pleasant but if there's no action what are we meant to do and how do we escalate the complaint? Shame on you Telkom.