Recuring issue with charges on my invoice for mixed account

<p>I have phoned in because of extra charges on my invoice where they say I have a land line as well as a mobile account and I DO NOT have a land line.</p> <p>I have phoned in numerous times and I keep getting put through to another department and no one can help me.</p> <p> </p> <p>I am being charged extra for a service (I say it again) I DO NOT HAVE.</p> <p> </p> <p>I would really just like for this to be sorted out.</p>