be wholly responsible
be fully responsible
be solely responsible

In this case, "Verizon was wholly responsible, and they took public responsibility."

You are the one wholly responsible for our being utterly lost in time and in space.

That isn't a lot of money but it's enough to keep out the jokers and those who aren't wholly responsible for their actions.

So the tribune decided that it would be best if one man was made wholly responsible, and stayed here.

The classes have been wholly responsible for keeping me interested and involved in my education.

The idea was that the various staff commands would be wholly responsible for defending their own geographic areas.

Adolescent brains aren't fully developed, as a result of this it's not possible to say that they are wholly responsible individuals.

The Mets held the lead in seven of their first eight games, and the starting pitching is wholly responsible.

The turkey, after all, is not wholly responsible for its banality.

You said that you were wholly responsible for putting the new team together.