3 months and no response

I reported a fault on my dsl line in December 2017 fault ref no 443cnk151217 I was contacted twice by a technician who was to come n check the issue but never turn up. This fault is still open. I’m getting no response Useless app reporting no feed back at all Now my line is dead. I’m being charged the full R599 but am not getting any credit. Emailed accounts thro their useless app no response. I just wish they had a competitor in my area