Residency Status for paying in-state tuition fees

I moved to Washington State on 15th Aug 2018 and started my graduation on 22nd June 2019 on H4 visa status. To avail the benefits of in-stat tuition fee I was supposed to complete one year of stay in WA state. So, on Aug 15th 2019 I as I completed one 1 year in WA I have applied for residency status change and got my approval. However on Sept 9th I went for my visa stamping from H4 to F1 and I got my approval. So, now I got to know from the registrar office that as i am now an international student I am no more eligible for the in-state fee benefits.
But before going for my visa stamping I made several appointments with my adviser and asked her clearly if my residency status would be effected if I get my visa converted and she assured me that once my status gets updated in the records of registrar’s office it wont be any problem . She just asked me to make sure that I go for my stamping after getting my approval for residency status and I did the same. Now when I asked her that I took her advise before going for stamping and this is what I was told, she said that they will go through the University and state policies and will see if they can do something.

Now I am really disappointed with this because the difference in fee structure is really high. What can be done in such a case where a student is misguided? because I followed what ever was told by her and because of her mistake I have to pay.