>>2048187
> single wiring issue that killed the throttle after driving through an ankle-deep puddle
it's not a "wiring issue", your hub motor is probably corroded to shit and fuck and the rust in it has probably soaked enough water for the controller to say "nope i'm not gonna self-destruct, the motor windings have wrong resistance, you are not riding today".
there are repair shops that specialize in e-scooters but:
-every repair is complex and expensive, for example changing the tire on a e-scooter costs quintuple the amount you would pay for changing a tire on a bicycle and double you would pay for a car tire change because it fucking sucks to put on
-anyone who would do it cheaper will either fuck up your e-scooter, refuse service (as OP mentioned) or make you feel disappointed that you paid for the service you could do yourself
-electronic parts (excl. battery because most sane services will refuse servicing batteries) are either expensive or dangerous to replace, as in motor controllers while cheap, have memory that keeps track of battery health, motor state, owners etc, while motor hubs, lights and other doo-dads are propietary garbage that is not worth repairing
-mechanical parts are made of chinesium and designed and assembled by apes, if you have a faulty bearing, you will probably have to weld together a contraption and use 3 different tools to change it, making replacing the whole wheel cheaper.

so if you want to repair it yourself i can walk you through the process, find you the parts or recommend what steps you can take to fix it, as long as you have the tools i got the know-how. pic related is most likely the issue you have but you don't know until you start taking it apart and troubleshooting.