The WORST service from 8x8 Contact Center

8x8 Contact Center was being used across the organization. We have had double charges for several months. At one point we realized that we were paying more than what we are using, we talked to the 8x8 Contact Center. To our disappointment, they only refunded 3 months of extra charges. After all this, we decided to cancel the subscription with them, the cancellation procedure took nearly 2 months to complete. During this time, I talked to them several times, nobody informed me about the cancellation fee. Again, I spoke to customer care a couple of weeks before the account cancellation checking if there are any charges for canceling, their answer was "none". But after canceling the account, they charge us $650.60, which was not discussed or informed at any point. A company must discuss or inform every single charge with the customers ahead of time. They cannot just deduct as they wish.