I have an Ancheer power plus mountain bike. The controller broke after 2 weeks of use. Original seller can't seem to get me a new one. Does anyone have contact info for Ancheer? Or know of a source for a controller that would work with this bike? I've seen some controllers on ebay for sale, but I've heard horror stories of receiving them with no wiring diagrams and/or having to do a lot of klugey splicing. Any help would be appreciated!