Comments on Discrepancy in Travel Claim
a) If the discrepancy was detected in your claim eight months after the travel or eight months since the claim was raised, the company still has the right to initiate disciplinary action against you. The discrepancy might have also been observed by the auditors.
b) If your company has set certain slabs for the travel allowance and you exceeded the limit, your contention is that the company should have paid you according to your eligibility. Why did the company pay an excess amount? But then the question arises, did you claim more than your authorization? If yes, why?
c) Suppose you exceeded the expenditure; however, you submitted the bill only for the amount for which you were eligible. Nevertheless, without looking at the amount mentioned in the claim, the company paid the full amount as per the attached bills. Even in that case, why did you not submit an application for the refund of the excess amount?
About Suspension and Termination
Whatever the type of misconduct, your company should have conducted a domestic inquiry and then awarded the suitable punishment. However, in your post, nowhere have you written about a domestic inquiry. If such an inquiry is not conducted, then your termination is illegal.
Solution
I recommend you talk to the HR Head to reduce the punishment. Accept your fault. You may ask them to impose a penalty that is 'X' times the claimed amount. If they accept your plea, you will be able to protect your employment. This, in itself, will be a major achievement. Does raising the excess claim merit termination? Is it at par with embezzlement? I do not have any case law. Other members may give their opinions.
Thanks,
Dinesh Divekar