Line dropping and breaking

<p>I've no make 5 calls to the Neotel call centre trying to resolve a matter. I even called from my cell phone. Since yesterday afternoon my Neotel line (which I use for my small business) is dropping calls. When I make or receive call the line is breaking up.</p> <p> </p> <p>I've asked 3 consultant to call me back if the line drops and nobody bothers to follow up.</p> <p> </p>