I personally rallied some dealers in my area and Nissan to go back to the manufacturer and get some satisfaction. In my area, the problem equipment was manufactured by ABB. Dealers supposedly had the ability to choose between suppliers but in this area they only had one choice.
The 20 kW chargers were problematic from the start but were under warranty. They would frequently break down but eventually be repaired sooner or later. Parts are/were expensive and once the machines were out of warranty the dealers did not want to start to have to pay high repair costs on proven problematic equipment.
ABB (the manufacturer) knew the equipment was junk and was interested in selling the dealers new 50 kW equipment. Now, you have to remember that any dealers who have Quick Charge equipment, asked for it and paid for the equipment, and Nissan Corp paid for the install and dictated the layout and design as they do with everything at a franchisee.
Dealers did/do not have to provide Quick Chargers. So originally dealers that chose to provide it shelled out around $15,000. Repairs per episode were costing in the thousands and sometime many thousands of dollars. Once out of warranty, dealers lost all incentive to spend that much in repairs for equipment that was doomed.
Customer complaints to Nissan and dealers, rallying dealers, and customers/dealers pressuring Nissan to go to the equipment supplier to pressure them into supplying supposedly better units. In this case, 50 kW units. These units are throttled back due to the initial equipment underground is not robust enough because it was only set up to handle 20 kW.
My advice is to be nice to your dealer(s) and talk to those at the top. I also suggest talking to the equipment manufacturing company and tech (if possible), become actively involved, and do what you can with them and Nissan to leverage the equipment manufacturer to repair or replace the lemon equipment. It has worked in my area! I just wish the the equipment could work at it's 50 kW rating. Good Luck!
*2011 Leaf 1 bought 2/28/15 @ 28,000ish mi 10 bar (8 bars @ 11/25/15 @ 37,453 ) (New lizard @ 39,275 mi @ 1/20/2016) Now 52,166 mi.
*Tesla Model S 61,000 mi
*2011 Leaf 2 bought 4/28/15 @ 24,000ish mi 12 bar (new lizard Dec. 2014 @ 22,273 mi) Now 35,485 mi