we had billed a party for a certain amount in the month of may 2018 which was cancelled (by us) due to a mistake in the purchase order,but now they say that they have not cancelled the bill originally and so they want the revised bill with the same number , which our accountant is not ready to accept, since the GST returns are submitted and the same cannot be revised..
..but the party is not ready to budge.
please advise with a solution asap.
Thanking in advance.