Use a single axis instead of a dual axis. Instead, set [Measure Values] aside and limit your measurements to Requests and Calls. This should provide the desired stacked side-by-side look.
If your data is organised so that each row level record is either a call or a request, you can construct a calculated field that utilises the proper colour dimension based on whether the record is a call or a request to get the colours correct.
If ISNULL([Call]) THEN [Request Type] ELSE [Call Type]
If your request and call measure are both in the same row level record, you'll have to utilise a combined dimension on the colour shelf.