I had raised an invoice of sale of goods to an ecommerce company. The company has issued a debit note (including GST) on account of some promotion expenses(as sale of my goods at reduced price). Paid the balance amount to me. No sales return, no defect in goods --- just issued a debit note by ecommerce company.
Can I issue a Credit note under GST and take the benefit by reducing sale and related GST while filing GSTR-3B?