A Transmission Problem?

I was driving on the interstate a few years back and the speed limit was 55, As I approached the interstate my car would not go past 15 miles. I took it to a transmission place and after waiting nearly an hour, the guy comes back to tell me it would cost me $90 dollars to fix the problem. Because I did not know anything about cars and I trusted him, I paid the money…however soon after I got home I didn’t feel comfortable with how quickly the job was done, so I took it to someone else, he looked under the car to see what work had been done, and found that the cap to the transmission had come off (which I didn’t know there was a cap, but of course there is…how would it hold the transmission fluid?) anyway…the guy found that the transmission guy simply stuffed the hole with tissue where the cap would go. I paid $90 dollars for that. If you have a story please share it, it may help someone else. Thanks.