You are not in a 12 month contract and we've never said otherwise. As soon as you enter the number and click order, you get a popup box advising the contract length, that you're bound by terms, a price list and cease fees may apply. If you proceed, you'll progress with the order. The terms agreed on the last page also refer to the same price list which clearly lists all one-off charges. If it had been a 12 month contract, you'd have had to pay for the remaining months - which you have not. You've paid a pro-rata amount up to the 30 days notice, for your service which was monthly.
The bill is generated at the time the notice is given for our standard invoice time of 14 days. As you'll know, we always give 14 days notice of an invoice.
I also explained yesterday that whilst in January we could not convert the line but as was discovered, you contacted us in April this year to ask about and we did advise that you'd need to get the line converted and for you to raise a sales request so we could go through the options with you. You never raised that request so it isn't quite true that "Every enquiry I have made since" has resulted in us saying we cannot. Further to that, I explained that back then (Jan) we could not but things change, we have been working on our internal development and can now do such orders. Making a statement to say that we said we couldn't do it over 8 months ago does not mean to say that we cannot now.
As clarified, there is no VAT on the cease charge and that was removed yesterday. You'll see that invoice in your account.
Matt