Worse ISP

I have I have a 100mbps line averaging 35-40 with a low of 5mbps, with daily downtime sometimes twice in a day. Tests done using Ethernet, Sometimes connecting PPPoE without a router. Their technician come after three months to see for themeselves, then they blamed the back-haul provider claming that they will take it up with them. 3 weeks has gone and I am still not getting a clear answer. Furthermore their technicians lack basic networking s****s, which makes me sick. They take all their time to answer the ticket with a technician will conract you, which never does.