Chelmsford? When you say that you've been inundated with complaints are you a Councillor there? If so you may know my brother...
I'm a Chelmsfordian myself and whilst I understand and agree with the irresponsible side of their use I don't see it as anything different to irresponsible cycle use. Where I used to see people (usually older teenagers acting like they're well 'ard) on bikes going up and down the pedestrianised High Street now I see the occasional scooter, they're the same in terms of potential risk IMO. I'm not excusing poor usage, just that the potential to cause harm has maybe jumped from one form of transport to another.
FWIW once I've sorted a new 'photo ID driving licence so I can use the associated mobile app I'll probably be using the Spin scooters (responsibly!) myself, there are usually one or two parked near to where I live.