Tax Refund for Addition Pension Contributions

I wrote to claim a tax refund for additional pension contributions in the 2022/23 tax year in early April but have heard nothing. I have used the "when can I expect a reply" tool and it said I should have heard back by 5th May. I've tried calling but it says that these applications are being worked through so I don't need to call. It's now been 4 months so I called today and waited on hold for 1/2hr but then I got called away. Is there any timescale available for when I should hear back?

Hi David Quinn,
The online checker is correct that we would have expected this to be reviewed by now. 
Please contact our helpline again to review. 
If you can call earlier in the day the wait times are lower:
Income Tax: general enquiries
Thank you.