THE ADSL Line that just wont work

For more than 2 years, I have had an ADSL Line which has given me intermittent service. As the Modem was old, I had the impression that the cause with the Modem. In the last few months, I signed up for a SMART HOME Package and was issued with a new Modem. Much to my surprise, the ADSL still continued to drop with the telephone line also dropping. After reporting the fault I was told (i) that I needed a new filter despite the fact that the filter was new and supp**** with the new modem, (ii) the modem was faulty and needed to be replaced. An SMS is sent after a technician reports the problem resolved. I have rep**** each time that the problem was not resolved but have never had further support until I reported a fault again. To date, the phone line is still intermittently scratchy and the ADSL line is not working. I asked a call centre agent to escalate the issue and to speak to a manager this morning at around 8:30am. Its 2pm and I have still not received the call.