Cannot deliver what they promise

I have very bad WiFi connection which goes hand in hand with downloading speed. Their tech people trying to solve these issues without any luck. After days on the email (27 pages in total ) and several phone calls from them where we spend hours on the phone I still have no joy. I have taped messages where the tech person told me that he has no idea what could be the problem - no that is what you call "service"!!! Speed is still a major issue and it is so frustrating when streaming and every 10 seconds it is buffering. I cannot believe that they cannot sort this issue out. This is the worst company ever, I also started a case against them at the Ombudsman. I cannot pay for a service that I do not receive!