Very slow internet connection- pathetic support

I logged a call 3 days ago for very slow internet connection. Nothing improved and on Tuesday I tried calling but waiting times were very high so tried live chat instead. More like dead chat. After raising the issue with 4 different operators who all cut the chat with no resolution or follow up. I explained that my connection was very slow and dropping. Today,(day4) I called again. I got through quite quickly and got a techie who went onto my machine with teamview and agreed it was very slow. I held on my cell whilst he worked. And then he did what every other techie I have dealt with this week did- dropped the call and terminated team view. I expected a call back from him to tell me what was happening but after 30 minutes realised this wasnt going to happen so called him and was told he was busy, so left a message. Disappointingly, he hasnt called back and I am still struggling with a pathetic connection speed. Really fed up now, I called and asked to speak to a customer service manager and got put through to an answering service to leave a message. Past fed up now, I called in again and complained to the receptionist who promptly just did exactly the same thing.