If you just want to keep the number or may be occasionally to accept calls using the number, you can buy talktime extend for just RM1 before your number is going to be terminated. I'm not very sure how long is the grace period after the line becomes inactive but from what I know, most DiGi Prepaid has a grace period of either 75 days (Best Prepaid) or 90 days (Smart Prepaid and LiVE Prepaid). Assuming it comes with a grace period of 90 days, you will need to spend only RM4 a year to keep your number.

Otherwise, you may want to consider Tron Prepaid (using DiGi network) or Friendi (using Celcom network) if you want to keep the line active at all times. A reload of RM10 will keep your line active for 365 days for Tron Prepaid.

Actually it is 3GB + 300 minutes calls for RM28 on DiGi Prepaid InternetPlus.

Promotion is still on-going. Can sign-up for this plan at DiGi Store Express at Mid-Valley Megamall or DiGi Store at The Gardens.

Not very sure about that but promotion is definitely still on-going. Need to act fast though as we're not sure when they are going to withdraw this plan from sale.