[tx, Ca] Airline Damaged My $15,000 Wheelchair And Will Only Fix *some* Of The Damage They Caused, Not *all*.

I've escalated, asked for a Complaint Resolution Official, filed a complaint with the airline, filed a complaint with the DOT, provided the information below, and they're still refusing. What kind of lawyer should I be looking for? I'm a poor disabled person so I'd need contingency or pro bono. What about small claims court? Thank you.
On domestic flights, U.S. carriers must FULLY compensate passengers for loss or damage to wheelchairs or other assistive devices, WITHOUT regard to rules limiting liability for lost or damaged baggage.
§ 382.131 Do baggage liability limits apply to mobility aids and other assistive devices?
With respect to transportation to which 14 CFR part 254 applies, the limits to liability for loss, damage, or delay concerning wheelchairs or other assistive devices provided in part 254 do NOT apply. The basis for calculating the compensation for a lost, damaged, or destroyed wheelchair or other assistive device shall be the ORIGINAL PURCHASE PRICE of the device.
https://www.ecfr.gov/current/title-14/chapter-II/subchapter-D/part-382
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