PissedConsumer review: Do not buy any used auto parts from A M Used Auto Parts in Lithia, FL

I ordered a transmission from them 11/15/2024 for my 2020 Chevrolet Silverado 1500LT pickup. When it arrived, I followed their requirement of replacing filters, seals, gaskets and fluid that was done by a certified mechanic. I then took the truck to the local Chevrolet dealer to program the transmission with my truck. After the programming it shifted very roughly. When I put it in drive it hesitated and "banged" into gear. It would not accelerate smoothly and continuously slipped when changing gears during acceleration. I reported this to AMUAP and they told me to have a diagnostics test run which I did at the same Chevy dealership. The test recommended that the transmission was in need of rebuilding. When I submitted the receipt to AMUAP, they asked for proof of parts purchase. I Submitted a receipt for the parts, but they rejected it. I asked why they needed a parts receipt after I established they sent me a bad transmission. After almost a year of back and forth communication they still have refused to honor their warranty. I spent $4,210.00 on transmission, $185.00 on parts, $1000.00 for installation,$230.00 for the programming and $246.00 for the diagnostic test. Then they needed proof that I had installed their transmission into my truck and the only way to prove that was a picture with their marking on it. The only way to get a picture of their marking was to remove the transmission as their marking was on top of the housing. So I paid another mechanic $400.00 to remove the transmission to take a picture of their marking. So I have a total of $6,271.00 tied up in a transmission that doesn't work and needs rebuilding.
The reason I did this was because I wanted to sell the truck and the original transmission was slipping as 2020 Chevy trucks start doing after 150,000 miles. Now I can't sell the truck because the transmission is bad and AMUAP wont honor their warranty. I'm a 67 year old disabled veteran on a limited income and can not afford this loss.
Their website claims they're a family owned business but their staff refused to divulge the owner's name after I requested to speak with them, this is a very shady operation. The manager's name is Alexandria Metallica but they would not let me speak to this person either.