GST INPUT on Shippjng company invoice

Vinod Shukla (8 Points)

25 September 2020  
Dear Sir,
Our company is a custom broker and have some clients located in SEZ. On behalf of them, we pay some charges like ocean freight on imports. We get invoices from the shipping companies in our name. We then after adding some profit raise invoices to SEZ parties. Since they are located in SEZ, we don not charge GST and for that we have submitted LUT. We claim GST input on the invoices of shipping companies. Now someone has told us not to claim input as you are providing services to SEZ unit.
Please help on this issue.