ESA misrepresentation

ESA have accused me of misrepresentation for  £400 pension which had been in payment for 10 yrs and I paid tax on when they have made consistent and continuous mistakes,  misinforming hmrc of wrong figures etc said I was over paid £900 last year after many complaints they agreed 1 x £12 to be paid March this year back tracked taking £40 from benefits I can’t afford refuse to review my claim for the last 5 yrs now I’ve got a compliance interview which I don’t believe is appropriate- surely they should be he’s accountable it’s making my illness worse