I just looked at my Ds merit letter and I don’t see anything regarding the cost of attendance, only her merit award amount.
https://miamioh.edu/onestop/your-money/tuition-fees/oxford-campus/undergrad-fall-2016/2017-cohort/index.html
This page details all charges however not for those entering fall 2018/2019. How did you find out what the increase will be?