GST Not received from customer

Ashish Chaurasia (55 Points)

15 March 2018  
I am a online service provider.i have GST No. but some customers give payment in bank account without GST.what can i do in this case?
Ques.1 we should pay gst on those bill or Not?
Ques.2 If i am not give any bill to customer then can i skip these bill from my return but payment received in Bank?