Idea Cellular — postpaid to prepaid card activation not done even after 48 hours

I switched back from postpaid to prepaid service and my postpaid service has been deactivated. I inserted new sim card for prepaid which suppose to active within 48 hours. It has been more than that but still it shows no service/emergency call only. Service has not been activated. I am not sure what the issue. This kind of service is not expected from idea. One side you guys are advertising to switch to idea 4g and here not able to provide service to loyal customer who has been with you since more than 7 years.
M: [protected]