So upon advice of some lovely MNers I rang the tax credit office and it turns out we are entitled to £60 a week support in the form of tax credits. A relief after we were initially rejected.
However, the reason we were rejected is because they didn't have my son on my claim form. I called them in April to update details (as we were waiting to complete tax returns). I gave them final figures for 16-17 income and was told that I'd likely be backdated money from when my son was born as they revise figures for self employed and then they'd calculate for 17-18.
This all seemed pretty simple until I had a letter saying I was rejected. The lady I spoke to in April said I could call in August if I needed to and not to call before then.
So we're entitled to £60 a week which they will backdate for 31 days. HOWEVER we were due at least £60 a week since Jan and it looks like we won't be getting that back due to their error. We've increased our debt levels since Jan and are now screwed with a massive credit card bill due to their error.
I'm so gutted. I'll ring CAB tomorrow. Does anyone have any further advice? It seems so unfair that we've been so careful with our money yet due to their error we're now saddled with debt that is going to be hard to repay