internet connection problem

Internet problems for months ! Many disconnects during the day. Also very slow speed most of the time (0.14 - 1.1 mbps). I have called the English line many times they open a ticket and then the technician close it saying that the line is fine or that he couldn’t reach me on phone (I got 0 calls) from English line they said that technicians speaks only German so that’s why they close the ticket. Well done o2