When we sign the documents required to trade with any broker we agree that the broker will not be responsible for any technical issues. This is a standard agreement with all brokers.
Please read the below link:
“Dealing with your stock broker? Remember this!”
A paragraph from above article:
“ICICI Securities (page nine) mentions: The client agrees that the stockbroker shall not be liable or responsible for non-execution of the orders of the client due to any link/system failure at the client/stock broker/exchange end.”