No ADSL for three weeks

I am currently on the fastest internet package pakage from Telkom . This cost me R699 a month . In light of the terrible speeds i have been receiving , supposed to be 20mbps but i never got more than 12mbps. I have made multiple calls and technicians have been out many times. Now is December 2017 i had a speed issue , tech came out and thereafter i havent had service. I have called over 10 times . Logged faults and even excalated however a technician has not even been allocated . I refuse to pay my bill and would like for some sort of progress . This is actually disgusting from a customer service point of view as i also used twitter and received an answer few days ago saying the delay was due to high workload in my area.