How do you handle this?

so I'm winning a ranked game it's 18 minutes in, its a easy win from here, a duo bot lane just both instead quit... we try hard for 10 more minutes hoping they come back but they don't, its now 30+ minute into the game the enemy team all spam.... taunts ect ect including.... ''none of us will report your dc'ers'. How you meant to deal with this? someone help.
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