Unblocking of blocked credit

Why ITC blocked by department ?

For Rule 36(4)

As your client take more than 10%of credit from the invoice that is not in portal the jurisdictional officer blocked it so you have to go to the office
he will ask you questions regarding return
statement of that particular period or say month and the itc your client claim
give the answer
some time they surtiny the as per their satisfaction
if they satisfied with your ans they will unblock it
you can check that on portal in service section