If your desired data is not shown, then you might be using the wrong data structure (Your hashref is not what you have expected).
Try using Data::Dumper to print out content of your hashref and see if it's indeed what you want.
If you still have problems with it, post the output of "print Dumper($call_list);" so I can have a look into it.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link
or How to display code and escape characters
are good places to start.