Dear Nitin,
You have all legal rights and remedies to recover this amount which was earlier calculated on inadvertent basis due to human error.
On every invoice there is mention of Mercantile law's term i.e. error of omission and error of commission and if any error occurs due to these aspect, then, no person can take undue benefit out of such error as even constitution of India does not allow unjust enrichment by such silly errors or mistakes.
You have following remedies, namely:-
- Please check whatever you are claiming in the Supplementary Invoice, is as per the terms and conditions of the PO/Agreement/Contract/MOUs.
- Send them e-mails, reminder letters, fax and SMS etc.
- Call them or have a talk with their, MD, CEO, CFO, COO i.e. Top Management.
- Write an e-mail or letter to their marketing head about this overdue/outstanding amount.
- Ask your Marketing head/CEO/MD to have a joint meeting with them to discuss each and every aspect of this matter for the purpose of resolving it.
- Ask them, that if they won't pay, then, you may black list their organization within India or world wide (as per the status of your organization) and this very message would be posted on your Organization's website.
- If all these actions do not work and send a legal notice but after having discussions/e-mails/reminders once again duly sent by your law department.
- You may also seek the resolution of this matter by appointing an arbitrator through you law department.
Please try these methods (stepwise) to recover the differential amount but the most important thing is to bring this matter in the very knowledge of your 'Top Management' immediately and also involve them.
Regards,
YAGAY and SUN
(Management and Indirect Tax Consultants)