Contact the Moderator_Team.
Let them know about the issues. Normally they will do a full refresh of your account.
Could be a minor bug. I had a similar issue with international text messaging.
This solved the problem.
I am currently experiencing the same issue, not receiving all incoming calls. It takes several attempts in order for a call to come through. Text messaging work fine and I can make outgoing calls fine as well.
My sister, who is also on public mobile is experiencing the same issue with not receiving all incoming calls.
I have tried the suggestions to restart, airplane mode etc but none worked. Submitted a ticket to the moderator, hopefully they can help.