As announced by Fizz here
This is the FAQ they give:
We decided to suspend the referral program for our mobile services during the stabilization period. We will honour, however, the requests already received. The referral program continues to be available for our Home Internet service.
The stabilization period will last at least until the month of July 2019, and will only end once the mobile network has been stabilized, and tested over the course of several weeks.