That leaves you holding the bag. Sadly, not much has changed in five years.
Telecom billing is still awful, and the incumbent phone companies are still the worst offenders.
As long as I ve been in telecom, the number one complaint business customers have had with the telcos is that their bills are hard to understand and full of errors. I ve even heard it suggested that the bills are deliberately incomprehensible, because that makes it hard for customers to find all the mistakes. This is not a minor issue. They take time, they cost money, and they prevent us from doing more productive work. This isn t news to you, and it isn t news to the phone companies.