Part amount paid after dishonour

The accused can raise the defence that the complainant has suppressed the material fact in the legal notice as well as in the complaint.  The accused may even argue that the entire case is defective due to the reason stated by you.

But on the whole I feel the accused cannot be exonerated from the lawful liability.  Because a mere suppression of fact cannot invalidate a case (case under 138) when the ingredients of offence has been clearly made out.

You can file a complaint under sectrion 138 of N.I.Act even you have received part payment of the cheque. The offence is related to dishonour of the cheque and according mens rea is counted. The part payment is not relevant to the extent the accused appears in the court and admits the partment. It will even give strength to your case if he admits part payment. The court while passing sentence can take the amount in the consideration while awarding compensation which may be twice of the cheque amount in addition to 2 years imp and fine.

why there should be variety of different las which are read by different expert with different opinions?

let the las ministry must treply.

Change the laws is neede fast.

Your complaint will not stand as there is no laibility of drawer of the cheque of Rs. 5 lacs at the time of filing complaint. Complaint can be maintainable for discharge of existing partly or fully lailbility and not for execss amount. You have also suppressed the fact of part payment even you ackoowledged for the same. As you acknowledged part payment this fact stand between winning og case.   

The Madras High Court has recently given a direct judgement supporting the views of Mr.Pande