Mister Transmission

"fixed" my transmission by rebuilding it at a cost of $3, 790. The transmission failed with in 23 miles. They towed it back in and kept it several days, then when I called every day told me that the car computer was bad. That is $1000 from the dealer. They said they could look for a used one they could put in. I said look and let me know. They did not let me know. They ordered one then when I called again for an update they told me I HAD to buy it from them for $250 and let them put it in or they would VOID the warranty on the parts and laor for the OTHER work on the actual transmission. Basically I have been blackmailed in to throwing more money at them when I do not trust them based on my experience and I would like computer expert not a transmission guy to do computer work. I think Blackmail is illegal.