@cash48: Please try opening the Phone app > Tap the 3 dots in the top right > Settings > Block numbers > Bock unknown/private numbers, and toggle this off if it is active. Tap the Back button > Caller ID and spam protection > Block spam and scam calls > Off. I also recommend tapping the Back button once again > Supplementary services, and checking your Call Forwarding and Call Barring settings. Let me know how you get on.
@cash48 if, what the colleague commented does not solve your question, try resetting app preferences. Access Settings/Applications, the three points on the top right-Reset preferences. Tell us, greetings.