Can't pay the tax I owe through my Personal Tax Account.

After informing HMRC that I owed tax earned on interest from savings I have received a P800 confirming the amount I owed. This tells me that I can pay online through my personal tax account. I do not want my tax code to be adjusted. When I go to my personal Tax Account it frustratingly tells me I have paid the right around of tax so am I unable to pay what I owe. Is there an alternative way I can pay e.g. by sending a cheque? If so where do I sent this to? Many thanks.

Hi,

You can pay by a cheque or postal order, made payable to 'HM Revenue & Customs only' with your National Insurance number afterwards. When you send your cheque, please also include a covering letter, giving  your full name and address, National Insurance number, the amount of payment, the year the payment is for, and the reason for your making this payment.
Please send both to HMRC Direct, BX5 5BD.

Thank you.