Letter of undertaking for SEZ supply

Sujit Kumar Das (75 Points)

12 July 2017  
We are a foundry house and used to supply our product to SEZ under Letter of Undertaking (LUT) till 30.06.17 with out Ex Duty & the LUT is valid upto 30th Jan18.
1. whether that LUT is valid in GST regime. if not,
2. whether we are now eligible to get LUT under GST regime?
3. If we supply the goods paying IGST, we or the customer will get the igsr refund? if it is possible for both then,
4. Can we force the customer to take ITC and to avail refund? or they can force us to take refund?

Regards
Sujit Kumar Das
9433036600