Closed my account - still on Credit score as open!!

I have closed my account in the month of January 2020, I have paid it fully and owe Lewis nothing, I have asked them to close my account completely as I do not want this account to reflect on my credit score any longer as an open account, to this day they have not updated their system to show it is no longer open. I have proof of my account being closed in a letter they have sent me, however, my credit score shows otherwise. I need this to be sorted asap!