view Multiple account and multiple action on each account

Iam trying to design a credit information web screen for call center employee where a client can have multiple credit accounts and every account can have multiple actions. The user can view actions on each account and can also add new action.

Thinking of showing this in a miller column but not sure if that is the best approach.

Please suggest the other design patters i can use here for this. The desktop version looks like this but I have to create this for web.

please help

If you see the first account is selected here in blue and all the actions for that account are coming in middle section. When I select the action I get to see the details in 3rd section under comments.