Removing blank cells from matrix

Hi,

So I have the following table set up which is just 2 fact tables and 2 dimensional table

I need a matrix view to show list of clients, and for each one show the total SUM of Talk times, Ring times, and Hold times (Hold split into attempt, cold, warm), a bit like this;

Iv tried to build this in power bi but running into some problems. For example my matrix is appearing like this:

As you can see there are blank cells where there are no values (eg there should be no ringtime for Outbound-->Hold). So, although its showing a blank cell, I need this entire column (Outbound->Hold->Ring) to not appear in the matrix as Ring does not belong to Hold. And AttemptHold, WarmHold does not belong in Ring.

How can this be acheived?

I have also inlcuded the example pbix file here

Thanks