I have not been able to recieve calls on s22 ultra. Bought it June 2022. No call barring, no forwarding. Sometimes calls comes through sometimes it doesn't. Rings from the other phones calling mine but it doesn't pop up on my phone. What do I do?

I have not been able to recieve calls on s22 ultra. Bought it June 2022. No call barring, no forwarding. Sometimes calls comes through sometimes it doesn't. Rings from the other phones calling mine but it doesn't pop up on my phone. What do I do?