HMRC income variance

Sorry for this long post but…

My daughter applied for student finance - she’s studying in London and living away from home.

She has been allocated the minimum 6116.

My total household income for 2019/20 was 66,823 BUT 30,000 of that sum was not taxable because I received a redundancy payment that year. So my taxable income for the tax year was 51,378 which is the figure on my tax return - I have shared my full tax return and calculations with SFE.

In addition HMRC have told SFE that I hadn’t declared 66,823 so SFE added that figure to the 51,378 to produce a total income figure of 118,201!!! I only wish I’d earned that amount - they are double counting my income. My tax return clearly states 51,378 and every time I call the self assessment tax team they agree with me.

SFE have submitted a request to HMRC twice and they have confirmed 66,823.

I have made a formal complaint but I’m really worried that this is just a automated process so won’t get looked at properly. Has anyone else experienced this? Does anyone know what I can do get get someone to look at this properly?