probably the easiest way would be to change the QV table to have expression per each Callcentre.
Your export will then llok like this
MonthYear Acquisitions Vault Cash… Supersize Hunters Winers… <MonthYear_1> <Acquisitions> <Vault> <Cash…> <Supersize> <Hunters>
That way you can create the chart you want.
It's still a bit tricky - you need to create the chart using the Header and one line of real data. After you have created the chart just replace the data lines with placeholders from nprinting.