Line down for 3 weeks

My line went down on 16 September. I logged the fault on 17 September. On Sunday 20 September 2015 I escalated the fault. Phoned regularly that week. On 25 September phoned again and was told nobody had worked on my line yet (after I had escalated!). So got another escalation number. Have being complaining on Twitter and Facebook and keep on getting told a technician is assigned. Phone again 30 September and was promised my line would be fixed by 3 October 2015. It is now 7 October and when I phoned the help line today was told there is nothing they can do except escalate, but I thought that is what I have done twice. Can't believe the terrible service (well lack of it). And nobody is prepared to help. The call centre blame the technician assigner (which nobody can get hold of).