I bought 2 brand new RadCity5s--a step thru and a high step plus. Assembled the step thru--no problems.  Assembled the high step.  No power.  The displays on the handlebars (controllers?) work.  No error codes. No power to the rear drive wheel.  Have never ridden the bike 1 block.  Took to a supposed certified repair place.  They disavow an affiliation with Rad (can never reach them).  Told me one or both controllers are probably bad.  RadCity will not respond to my email inquiries (no phone, no chat, no text).  Thoughts?  Are there replacement controllers I can purchase?