@Haseebnoor hi ok he received his 10 dollars so in your self serve account is there any refer a friend reward for 1 dollar because that should be what you receive not the 10 dollars!
Firstly, when you say your friend put in your number, do you mean your referall code because they do not use phone numbers for referalls anymore, it's a personal referall code that can be found in the overview of your account (on the right hand side).
Secondly, when you refer a friend, the friend that enters your unique referall code receives the $10 credit. You do not receive this. You benefit by receiving $1 off every month that your friend remains an active customer of public mobile.
If you log into your account, and check the rewards section, you should see under refer a friend $1, which will be deducted on your next renewal payment.