wellygary:

Bung: 

If you still have a landline connection and can't get the phone working properly that suggests that there's a fault in one of the connections. How are you checking them, with a meter or just visually?

Yip, it certainly sounds like a fault on one leg of the copper pair , (could be on your site, or more likely in the line from the Exchange to your ETP)- 

Irrespective of complaining about your BB speeds ( which will have CSRs telling you do do a whole lot of stuff) 

Simple call your ISP and tell them your landline is not working correctly....