How do I contact Customer Service? January 19, 2021 18:54 Our Customer Service team can be reached by phone at 1-866-954-9786 or by email at email@example.com. Related articles When is Diono's Contact Center open? How do I make a warranty claim for my Diono product? How do I request a return? How do I order replacement parts from Diono? Radian RXT (Manufactured prior to May 2016) Comments 0 comments Article is closed for comments.