You're not overreacting. Shit melting on the unit is not acceptable. And no, you shouldnt need a cert in electronics to run a damn light.
I worked EMS for many years and house fires are the worst. To this day, there are certain substances that trigger my senses from those horrid scenes and it makes me physically ill.
Regardless of what type of lights you run, every grow should be equipped with at least one auto fire extinguisher.
Even a couple of these would do.
AFO Automatic Fire Ball Extinguisher With Mounting Bracket ABC Fire Extinguisher, Fire Suppression Device, Fire Safety - - Amazon.com
Hopefully Spider will make this right.
IMO, customer services carries equal weight to providing a quality product.