Claiming Council Tax backdated

We recently claimed for council tax after seeing your show. We were able to get a reduction of over a £100 from Durham County Council. We did not know we could claim this until your show. We put a claim in for backdated council tax to the year that we started fostering. We were claiming from 25/07/2012 up to 14/05/2023.
We received a letter with there decision stating.
“No continuous good cause to backdate. You state you didn’t realis may be entitled. We would expect reasonable enquires to be made by a customer to determine if they may receive Council Tax Reduction. It is the claimants responsibility to claim in a prompt manner”
Those are the exact words.
My question is how would we have known we could claim council tax if it was not for your show/ money saving website.
We did not think we would receive it as we receive £4000/ month for the family of three foster children whom we look after. It does not state that foster carers would get a reduction on their Council Tax. Do you think we should speak to a solicitor?
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