Paid twice

I paid my tax bill. However, several days later I received emails and messages saying that I hadn't paid it and that I was at risk of being fined. There was no receipt to say that I had paid so I paid again by a different method. How can I get refunded?

Hi,
Please contact our Self Assessment department by webchat or phone:
Self Assessment: general enquiries
They can refund this credit, or give advice if the first payment isn't present on your statement.
Thankyou.