As a general saying, a Supersaver ticket is not refundable. For which route was the ticket, and why did the journey take 2 hours longer? Due to construction works?
If you do not want to travel, because the connection is no longer useful, e.g. due to construction works or a line interruption (hence, due to a railway failure), you were required to immediately contact the SBB Travel Center or an SBB train attendant before travel; any of them would have issued a confirmation for the non-use of the ticket. With this confirmation, you could have requested a refund. Otherwise, there is no way to refund a ticket as you do not have a proof that it was not used. You could have used the ticket on an alternative connection, though.