Some update here, if you still using Digi Prepaid Best, and your internet is Pay Per Use Or PAYU RM8 , you may contact Digi to cancel the PAYU internet and enable the free internet RM0 package so that you will not get deducted RM8/day internet usage (1mb/10c) if your Chili Padi Subscription expired without your notice.
Therefore, you are able to keep the Super Long activation RM38/ 365 days for future use in case you decided not to subscribe any Chili Padi package or keep the phone number as backup or spare.
I also manage to get back the deducted RM8 credit for internet usage without my knowledge after changed to smartphone from non smartphone.