ANIL CHUMBER

Hi, I received a P800 letter indicating that HMRC owes me £785.40. I have an HMRC account, but when I try to reclaim the amount online, it says, "The online refund service is not available to you. Contact HMRC to find out how you can get your refund (opens in a new window or tab)." I also tried to do without gateway ID or sign in. Any assistance would be appreciated. Thanks.