A Plus Transmission Specialists

A Plus advertises a $ 29.95 transmission fluid & filter service all the time with coupons in the mail. This is a bargain, so I took my car there for service. They did not perform well at all. In fact, I was yelled at and told not to return to them for any service:
The car is a 1963 Nova with a Powerglide transmission. This is not something they see every day. I made an appointment for the following morning and took the car in. I was told to leave the car and it would be a couple of hours. I told them of a couple of shifting issues that I suspected might be an adjustment that wanted them to check while it was there. «We’ll call you when it is ready.»
I called them back after about 5 hours and they said it was ready. I really expect someone to do what they say, not say something and ignore it.
When I picked it up I was told that they they had tried to adjust the shifting, but the cable was messed up and they could not fix it w/​o replacing the cable. I said that the car has no cables, but whatever. The guy asked if everything was OK. I told him I wasn’t too happy about the length of time, but other than that it was OK.
When I got home I received a call from an irate manager (I guess) mad at me for discussing problems in front of other customers (one) in the office. He was fuming and said that they they had done everything they could and that, «Yes the car has TWO cables to the transmission.» (In fact, a 1963 Nova has NO CABLES. It uses steel rods to shift the transmission into gear and another to connect to the carburetor for passing gear down-​shifting. When I checked the adjustment from the carburetor, I found that the dirt had not been disturbed which showed that they had NOT EVEN TRIED to adjust it.)
The manager continued to yell at me telling me that they did not want my business. I asked him what was wrong. I said that their service had been OK and that I would probably use them again. I don’t know what his problem was, but his attitude and demeanor convinced me to stay clear of this business.