Cannot make outgoing calls, cannot receive incoming calls

As the title states, I cannot make any calls neither can I receive calls. When making calls, "call ended" appears instantly after pressing the call button. Sms are fine. I have tried changing my baseband from Australia firmware to Singapore firmware to no avail. Here are some of the details:
Carrier: Singapore starhub
Rom: venom note v1.4
Kernel: skyhigh
Baseband: AOJ3
Please let me know if any other information is needed!

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