Airtel — I get error 536 message

Address:Kozhikode, Kerala, 673028

1 am getting an error 536 when try to dial *121#. I recently ported my prepaid idea sim to airtel postpaid. I am not able to register for an account in airtel for online services and change plan. I am not able find my bill cycle and any other details. It showing enter a valid airtel number or "no service is
Associated with your number whenever i try to register"
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