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I understand how frustrating this is. Here are some troubleshooting steps you can try to get the phone working again for those calls. https://www.samsung.com/us/support/troubleshooting/TSG01001613/
For concerns with text messaging, you can try these steps: https://www.samsung.com/us/support/troubleshooting/TSG01001439/.
If the troubleshooting is not helpful, you will need to follow up with your service provider for additional troubleshooting steps, as they are responsible for these services.
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.
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Not sure if it will be any help....I have an S22 Ultra here, but I don't have a SIM card in it yet. There is no "Mobile Networks" or "Network Mode" in any setting anywhere. So, I opened "Connections" in the Settings, and typed "mobile network" in the search data field. Several options showed up that looked like it would be possible to use 4G LTE instead of 5G, but as I have no SIM card in, they are all grey / inactive. I would be curious to know if you are able to change the network setting to 4G LTE in any of those setting options, and if so, if it stays at the setting you put it at and doesn't switch back to 5G on its own. I would like to be able to turn off 5G so my phone won't be always searching for it and drain the battery. Maybe if you are able to change your phone to 4G LTE you might also solve the trouble you're having.