Andromeda

Dear all, I have both submitted my self-assessment and paid the required taxes. However, visiting "Current position" in my account, I can see on the one hand that paid money is available for repayment (overpaid), on the other hand, I can see that a balancing payment is required due 31st January with the same amount of money. Could you explain what kind of additional actions I need to do to be sure that your systems accepted payments and I do not owe anything? Thanks in advance.