博班轉碩班需要重新申請CAS與簽證? - 留學

不知道是否有前輩聽說過這樣的問題
本人因為個人因素問題
必須從博士班轉成碩士班
問題來了...我的簽證是四年效期
學校跟我說我必須要重新申請CAS number與簽證
但我在UK border Agency找到下述文字:

If you want to do a different course of study with your education provider
You do not need to get our permission if you want to do a different course of
study with your Tier 4
sponsor and the new course will finish before your current permission to stay
expires. Your Tier 4
sponsor will tell us that you have changed course.

If your new course will end before your permission to stay expires, you must
tell us by sending an
email message to [email protected].
If your new course will end after your current permission to stay expires,
you will need to make a
new Tier 4 application to us. You will therefore need a new confirmation of
aceptance for studies
from your Tier 4 sponsor. You can make this new application at any time
before your current
permission to stay expires, but we recommend that you do this as soon as
possible.

想請教依下是否有人有過類似經驗或是聽說過類似的狀況
我是否該要重新申請CAS number跟簽證?(因為英國當地申請簽證很貴也很麻煩)

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