Miss sold vodafone broadband

Hi guys just wondering if anyone has heard of a similar situation and how it was resolved, any help or advice would be great . So long storey short, basically i've been a vodafone mobile customer for 9 years. Out of the blue in august i get a phone call from them saying that i've got this deal for existing customers which is far better than what BT were offering me. Problem was i had just started a new broadband deal with BT in May. I told them i was not interested on that basis. Next thing the operator said that vodafone will cover any termination costs and everything will be free apart from the monthly fee. So i signed up to vodafone broadband. Fast forward to last friday i received an email from BT saying that i owned them £381 for breaking our contract but it was more of a courtesy email as the money had already been took.
So i rang vodafone explained what happened and although very helpful they say i've to wait 14days before they can listen to what exactly was said and how to proceed. They told me to ring BT to see what their side of the storey was. ( i'm postive they mentioned the the termination because £381 up front to save £20 a month is not a good deal)
I then rang BT hoping that there would be an easy explaination but they didnt know anything about it other than the swap over of broadband service. I tried going back with them aswel to my oringinal deal but the contract was settled. (Hopefully that all makes sense)
So now i'm waiting on vodafone getting back to me and hoping they will see the situation in my favour.
So basically my question is has anyone had a similar experience with them, what should i say and what was the outcome. Thanks in advance