LoanDepot Mortgage Complaint

LoanDepot Mortgage department,

FHA mortgage Settlement process and costs California

on -/-/2014 i bought a house with the agreement that my interest rate would be 3.25 % I have documents that have this interest rate on them. The other day I was going through my paperwork on the house and noticed they had changed the interest rate without telling me it was changed in one day to 4 %. i closed on the -/-/2014 with an interest rate of 3.25 % and on the -/-/- they raised it to 4 % were they legally able to change that on me when I closed in time for the lower of the two. I did not catch that when I signed the docs.