Invoice cancellation under gst

Sonam (student) (23 Points)

06 December 2017  

Dear Sir/ Ma'am,

I am issuing the invoice in the month of October and also taken the same while filing GSTR 3B for the m/o October. But, now for the same invoice, no payment is received to me. So, please reply me, what is the provision under GST for the same, whether I can claim the refund or whether the cancellation of invoice will credit the GST amount of the same invoice in my electronic credit ledger.