Hi there @victorychan and welcome to the Community!
We're really sorry to read about your experience and understand that receiving an unexpected amount on your bills is never pleasant.
Just a heads up, the Community is not a platform to get assistance but a place where other users may share their insight to help others with their situations. To get assistance with yours and in order for us to access all the details of your account, you can reach us out in private on Facebook, Twitter or Instagram. We'll be happy to take another look with you if you still have any unresolved situations, thank you!