Ok, so I think that you need to update your Costs query to be grouped by ConsumedService so that the value that you are passing in via filterColumn will actually have a corresponding column in the Costs query. If you visualize your Costs query as a datatable you will see that right now it is only returning the total sum not broken out by ConsumedService.
Here is a similar question that was posted a while back that may give you a better idea of some things to try.
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