Wisconsin Shower Door

We ordered a shower door from this company to replace a rather unattractive door because we were going to put our home up for sale. They told me installation would be $125, but they couldn't do it for 3 weeks. I decided to do it myself. Well my better half convinced me to have them install it. So I called back and scheduled the installation. 2 different people there told me it would be $125. A day or two before installation the installer called to confirm the date and time and tell me that it would cost an additional $50 dollars. He felt bad about it but said that's what the boss told him to do. He was told to tell me it was because I had measured it myself and they "may" have to do extra work. Well the installation went perfectly and I had measured correctly. I feel like we were ripped off for $50. Be very careful and get other quotes when dealing with these people.