Credit note query

Sandy Arora (Admin) (31 Points)

16 October 2017  

I bought a hosting online with 30% discount coupon at the time of purchase. Cost of the hosting was Rs. 10,000 + GST and I paid Rs. 7,000 + GST.

Company gave me three things:
1. Invoice of Rs. 10,000 + GST (without showing any discount)
2. Credit note of Rs. 3,000 + GST (for the same invoice)
3. Receipt of Rs. 7,000 (without mentioning the GST amount)

Here's the problem:
1. At the time of filling a 3B return, what shall I mentioned in Input tax credit?
2. Is Credit note an income for me? Do I need to show somewhere?