Car Company Sold Me A Car With Rats

So here's the story... I purchased a car from an online car company - 2017 Infiniti with only 15, xxx miles. Online, the car looked like it was an absolutely fantastic condition. There was no marks on the Carfax stating that it had been in an accident, only two owners, and was driven very limited amounts over the years. On their listing, it showed only two small areas that had damage damages, a small dent and a small scratch near the door. It was the exact spec that I wanted, and I couldn't have asked for a better mileage, so I paid the money and got it. When I received the vehicle, there were way more undisclosed damages than previously expressed. The back bumper had obviously been repainted after being in an accident, there were dents and scratches around the whole car that were clearly visible, the original dry-rotted tires from 2016 were still on the vehicle and I found rats living in the engine bay (as well as an extremely foul smell inside the vehicle due to the rats urinating everywhere). I reached out to the company and they told me that all of the damages are "normal wear and tear" and that they would consider sending me a check to have it washed and new tires put on. I immediately took the vehicle to the Infiniti dealership and they told me it would be necessary to have a full engine scope done, wiring harness checked, fluid flush, and many other services done to make sure that the vehicle is safe enough to drive after the possibility that rats have chewed up the internals. After telling ‘the company’ that I would like to return the vehicle and trade it out for another one of this year making and model, they said that they did not have any that matched what I currently have. At this point, they have sent $2k in reparations to get the new tires and a "detail" done. I paid 40k for the car, and my recent evaluation has significantly decreased the value due to the undisclosed damages, rats, smell, etc.. The estimated repair costs are between 10-15k- which once serviced and put on the carfax, will decrease the value of the vehicle as well. I want to take them to small claims court but can't find their legal representative in Texas to serve the papers to. What should I do, and could I win this in small claims myself?