non supply of service

Have ISDN line and DSL line (separate lines). Have had on-going problems for 2 years.<br> ISDN line goes off almost every day, sometimes a few minutes and are able to reset, sometimes for days. When fault is logged, get messages the next day saying fault has been resolved when it hasn't. Have to log new fault. Even when line does come back it usually goes off within a few days again. <br> DSL: line drops every few minutes. Sometimes it comes back within twenty minutes, sometimes it stays off for days. Have been told by call centre agent that \maybe a technician will come today or tomorrow