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Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
For clarity - you had the same NI number held in both names is that correct?
Can you find any evidence of that - old payslips etc?
Have you asked the DWP to confirm this
You can contact the tax office
The other option is a rather ridiculous one of creating a change of name deed (free template here https://www.netlawman.co.uk/d/change-name-by-deed-poll) to show the change of name.
You can then destroy it afterwards
I hope that this is of assistance - please ask if you need further details