ADSL down for 2 months

I have had issues with my ADSL since November last year. I had asked to upgrade my line back in October to faster speed. However my line has gotten slower and now stopped working. My internet connection shows its fine and looks good for couple minutes and then just drops to nothing. Completely dead. Stays like that for hours. Then every now and then get something going through. I have logged a number of tickets and asked for escalation and yet I am still sitting with the higher cost line that I can't even log a complaint on the Internet as it takes too long (using my phone now). To add salt to the wound they have just closed the previous tickets and can't see them even though issue is still there.