NI act on Blind person....................................

My father is 69yrs old and lost his eyesight 4 yrs ago to Glaucoma.He is totally blind. He left his account books some other documents in his office after he went blind.There was a chequebook, account of which was dormant from 2012. He never used the account since. Our neighbour used to use our toilets evey now and then. We never mind about that. Last week, we recieved a notice from our neighbour that we owe him 2.5 lacs and a cheque was sent back from his bank with note "non cts cheque". Now he has sued my father under NI act. My father does not even remember when he left a cheque with his signature on it. The date that was put on the Cheque is two weeks back. The nighbour is claiming that my father have him cheque two weeks ago but my father never gave it. My questions- What should be our first step to counter this fake case? Does he have to furnish a bail bond in court? Does he have to go on every court date? As it is a fake case can we do a counter case of 420 or not?