I owe PayPal money

I owe PayPal 56 pence as a result of a currency conversion charge from a long time ago I think. Today I recieved an email nagging me to correct my balance and decided to attempt todo something about it, so I login to my account and attempt to add funds but it refuses to allow it just returning me to the form highlighting the fields that I have filled in sucessfully. So I looked at the email that PayPal had sent me and noticed it ended with: We appreciate your cooperation and invite you to reply to this email with any questions. Yours sincerely, PayPal Please do not reply to this email. This mailbox is not monitored and you will not receive a response...... So I replied to the mail and we'll see how we get on. They do accept cheques to fix my balance but I signed up with PayPal to get away from cheques....