I want to change into student plan

Since the first time i had Adobe subscription, i was using the student plan with 75% off for atleast a year, but one day my plan changed into regular subcription without me knowing it charges at normal price for several months. I tried to make a plan in student plan, but still it says “purchase is not supported” because i already have the adobe CC pro. The only way i know is to cancel the plan first before starting the student plan which requires me to pay the cancelation fee. Is it possible to change from this regular subcription to the student plan without the cancellation fee?