Sum number range with two sets of criteria listed with merged cells

Hey, everyone!

I've been searching for a formula to solve this one, to no avail it seems...

On the Data tab, but displayed on the Simplified tab, I'd like to sum the numbers listed in column C if the it matches the adjoining cells in both A and B columns.

I tried using this formula, but it didn't work...

=SUMIFS(Data!C:C,Data!A:A,"Jason",B:B,"Calls")

I feel like I have the ability to be very specific with the information, just haven't figured out how to point it in the right direction.

Any ideas?

Thanks in advance, guys!