Have you tried using the 120-volt adapter to see if it will charge at 120 volts? Again, there should be no argument that it is covered by warranty so be persistent.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019