They did. No, I did not get the option of keeping the December UY.
Let me explain further. Our original contract was December with 165 points, and the 2nd was February with 180 points. We did a number of changes to that original contract - for example I also added DH's name to the 2nd contract, and we ended up not financing in the end.
We got the new February contract upon adding DH's name and adding the additional points.
I think the deal with the December UY is that it's actually 51 years, not 50.