They do try to recover stolen/lost bikes like that when they can – if nothing else but to salvage any working parts. However, like a lot of places, they’re understaffed on the operations side so don’t always get to reports in a timely fashion. Given the location (3 miles from the nearest bikeshare station), that makes it that much harder to fit into the work queue. Of course, that doesn’t explain any run-around/lack of response, necessarily, on the customer service side. Curious – did you call them or contact them via other means?
Not that it applies here, but if there were a bikeshare station nearby, docking it and then reporting it needing service at the dock would be the ideal way of “returning” it to them.