Hotspot lit on fire

At some point last night my Tmobile hotspot purchased online (December 2022) lit on fire at the charging port. Have been using the same charger and cable for now 8 months without issue.

Tmobile support is completely useless and refuses to do anything to help: "can only do a return under 14 days for buyers remorse". Their other option was to go to a Tmobile store. I am not driving hours to a store to *maybe* be helped or not. I purchased this hotspot because we are remote and need backup internet, there are no nearby Tmobile stores and we cant travel often. 

I live in Maine and we have a legally mandated statewide four year warranty on anything purchased. My next steps are filing a complaint with the states consumer protection division, not sure what else to do at this point.