Claim Taxback on payment into pension

I am a salaried GP and my pension contributions are paid into my pension scheme pre-tax by my employer. Unfortunately, it has come to light that my employer didn't use the correct pension contribution banding percentage for my salary, so I have underpaid on my contributions for the previous 2 years. I therefore need to pay my employer back this money (as they have already now paid what is owed to the NHS pension provider/scheme). (Approximately £2000) As I have now already paid tax on the money received that I now have to pay back, is there any way I can claim tax back on my annual self assessment or can/should this be done another way please? thanks

Hi,
You will need to amend your tax return to change the pension payment figures, in order to claim any tax relief due.
Thank you.