> Is there anything I can do about this?
This is a member-to-member forum, but with a few Shaw employees voluntarily participating. I am a customer, not an employee, of Shaw.
So, not knowing what services you were getting, and what changes you made, and how long ago that you made the changes (is there is a possibility to "back-out" within 72 hours?) we cannot help you. You'll have to contact Shaw, again.
Recently, when I was talking to Shaw, the "grandfathered" plan on the account was active on Shaw's "old" accounting system. The Shaw employee had to "migrate" the whole account into Shaw's "new" accounting system. After that, the Shaw Phone service is still active, and "Internet 15" became "Internet 300". Now on a "two-year Value Plan", the charges are now $1 less per month. YMMV.