Well, the forecast is not good. If you could post some pictures of your installation, we could possibly opine. The unit you chose is not bad, and actually not that hard to install per instructions!
Let us have a look at some photos. But, you have to live with this for another 15~20 years. It is possible that you might have to suck up the loss and redo it. But first, please give us some photos. _There are some really talented guys here, and if there is a way to fix it , someone will tell us.