Calvert's Express Auto Service & Tire Calverts Express Calvert's Espress Ruined my Transmission Overland Park Kansas

I have a 2006 Toyota Tundra with 90,000 miles. I have never had any issues with it at all. I had Calvert's Express do a automatic transmission fluid drain and fill. The transmission started having shifting issues immediately after this service. I took it back and they told me it was a little low and they filled it. A few days later the shifting issues were apparent again. I had no power and could not go over 10 mph. I took it back to Calvert's Express the manager drove it and got a Check Engine light code for Transmission solenoid pressure failure code. I expressed concern that an after market fluid was used by Calvert's. The manager told me that he would change the fluid to factory Toyota fluid. A few days later the tranny did the same shifting issues. I took the truck back and now there was a new manager at the store. He told me I should have never changed the fluid and that just changing the fluid could cause issues. I took it to Toyota Dealership and was told that the NON Toyota aftermarket fluid used by Calvert's was the problem and that my transmission would soon FAIL. Toyota even told me that AFTERMARKET FLUID WOULD HAVE VOIDED A FACTORY WARRANTY. I want Calvert's to pay for a new Transmission. They are the professionals and should have known not to do the fluid change. I feel that Calvert's changing the fluid a 2nd time with actual Toyota brand fluid is an admission of liability that the aftermarket fluid used the 1st time was sub par, if it was not why would they even change it. It is now a safety issue also because I never know when the transmission will fail and I will not have power to get out of the way of traffic