Actually many parts on both mid-high range helmets...and your motorcycle are held together with doublesided tape.

Just use the double sided tape or superglue. Did you some expect them to send you a $30 vial of proprietary "helmet glue"?

Or perhaps you would like them to charge you $20 shipping and another $50 for "helmet repairs".

You should be thanking the company that they're trying to be honest and save you $$$.

Also, you did not pay $750 for the helmet. It is an HJC.