SLOW ADSL and no answer from consultants on 10210

Slow DSL speeds, report the fault every 3months. 4Mbs line and only get 0.44Mbs.???? No consultants ever answer the faults reporting line 10210, Hold on for more than 45min at a time with no service and been trying since 09/02/2015. Reported the fault several times online and receive a message that the fault has been resolved??? I MERELY REQUIRE THE SERVICE(4Mbs) THAT IM BEING CHARGED FOR!!!!. At the end of the day they take your money and have a don't care attitude!!!!