Credit is how Ahmedabad trades, so unpaid invoices are the usual dispute.
Ahmedabad sells on credit. Textile, chemical, pharma and engineering firms in the Naroda, Vatva, Odhav and Changodar belts ship goods on a promise of payment in thirty, sixty or ninety days, to buyers across Gujarat and in Rajasthan, Maharashtra and beyond. When a buyer stops paying, the seller usually holds an invoice, a challan and a long ledger, and nothing that states the debt in plain terms. A legal notice does that. It fixes the amount, the due date and the demand in one document the other side has to answer and a court can read later.
This page covers what is specific to Ahmedabad. The basics of the document are in what is a legal notice, and the service and fees are on send legal notice online.