Since the network 'shows' busy, it could actually mean that the network is jammed. This may allow text messages, but not calls. The problem is with the network and not your phone.
Contact your mobile service operators to know what the issue is. They could be working on the system. But if they are not, I'm sure would able to restore full network so you can make and receive calls.
Please do let me know if this helps.
Have a lovely day.
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