Don't feel bad, a co-worker had a similar experience with his installer two weeks ago. The guy came out with the AT-9 and H20, but said due to a large tree in his yard, he didn't have line of site for the AT-9.
The installer left the AT-9 in his garage, and said once he had the tree removed, call his cell number and he'll come back and install it for only $40.
When my co-worker told me this, the red-flag went up. I asked him how his signal was with the current Phase III dish, he said everything was in the 90's.
I then asked him where the big tree was in relation to his Phase III if looking from behind the dish. His reply, the tree was to the right of the dish (or more West-ward). We then looked up his house on Google Earth, and he should me the where the dish was and you could clearly see the tree.
The tree looked like it may block a satellite at the 140-degree position, it was nowhere near 99 or 103.
Anyway, he called retention, they sent another tech last Thursday, and installed the AT-9 where the Phase III was without a problem. The tech said the original installer would probably be fired because of what he did (or didn't do), and because he tried to charge him for a return revisit.