I believe you would want it set up to be :
NotBillingOrTechnical = ~PairExists(“call_type”,“billing”) & ~ PairExists(“call_type”,“technical”)
or
NotBillingOrTechnical = ~(PairExists(“call_type”,“billing”) | PairExists(“call_type”,“technical”))
For clarification:
~ = not operator
& = and operator
| = or operator
I think I have my operators [symbols] correct; refer to the documentation to see what the correct symbols are.