@Alexandf what is OP asking CSA to do here? Check if an email was sent?
You may or may not have received an email if you activated a Public Mobile SIM card @a7r7t7 .
1-were you charged for the SIM card activation and choice of plan?
2-can you log into your My Account?
If yes to both or either above, then you activated.
If you are porting from another mobile provider leave your old provider in your phone to receive the SMS port approval text.
See helpful info. here: https://www.publicmobile.ca/en/bc/get-help/articles/port-fraud-protection
If you activated with a new number, then insert the public mobile sim card into your phone and restart the phone.
I'd suggest a network reset of the device is a good idea when activating with a new provider also.
Just make sure your phone is unlocked and compatible with Public Mobile. If no services in your phone, find another phone to test if any services work to rule out or identify a device issue.
