Wondering if anyone has a workaround for this.
Currently using CallRail to send Phone Calls and Contact Form Submissions to Facebook as Offline Event Sets.
In FB you can create a Custom Conversion. Issue is, that you can only use 1 offline event per custom conversion. And when you are running and ad, where you want to optimise for conversions, this causes a problem. Since you are only ‘converting’ half of the real conversions. Skewing the data.