these temporary promotion techniques really deterring ppl from jumping ship

Confirmed. I've tested it just now, off-net call 11sen/30sec and sms 12sen/sms.

From the free 2.5GB weekly quota

hello.can i change my plan from digi live prepaid to digi best prepaid?

Received mine SIM card last Friday and waited until Monday with no sms. Solved it by going onto the Digi Live Chat. Gave my phone no and the SIM card serial number and received the SMS prompt within a few hours later. Complete transfer within 24 hours.

Sorry my bad. I've logged into the Chat using an existing Digi broadband number. Not sure for new users 

me dont mind as long price  50% cheaper than maxis 
hotlink fast 3.0 RM30 just got 2GB + 1 hour happy hour + 1gb sat + 1gb sun +  1gb 3 day + 300mb  2days.

I got digi promo credit, can I use it for google play or digi app voucher purchase?

can i comfirm  does digi live support radio streaming ?

I didnt get the 1000 mins free call       

[1] SLL 365 days @ RM108 is available for Best 2017, you can find it only when you have credit balance >RM108.
[2] topup RM100 to get 120 days active period with at least RM100 credit.
      - If top up at Maybank2u before 31/12/17, you get 20% extra credit but the bonus is valid for 24 hours only.
      - If top up at MyDigi, you get 10% extra credit but the bonus is valid for 3 days only.
[3] With the RM100 credit, you can buy
      InternetPlus @ RM28 or RM38 for 30 days and auto-renewal.
      So you may have to reload your line before expiry period (120 days) for 3rd renewal on InternetPlus service.
      and SLL is not useful for you as you always reload to get 120 days active period.
      same for best and live.

This is my main line and I need talk time with data, is Digi Prepaid Best the only option to buy Internet Plus or can I use Digi Prepaid Live to buy Internet Plus.
Thanks in advance for your recommendations.

You mentioned you want to keep a number, so I assume you are planning to MNP To Digi online (so you will get a free McD burger!)... If you choose Digi Best (Version 2017 only),
[1] Free 1GB high speed internet everyday from 12am-8am. If you don't buy high speed internet, you still can use basic internet (capped at 500MB per calendar month)
[2] If you make IDD calls (10 countries only) >RM1 in a day (I called China 13 times in early morning to spend RM1.04, the cheapest possibility), you get another 1GB high speed internet to be used till end of the day (11:59pm).
[3] You top up RM30/50/100 to get 30/50/120 days active period, and RM30/50/100 (+bonus) credit.
[4] Use RM108 credit (not top up) for SLL 365 days. You can find this in the menu only when your credit >RM108.
[5] So when you activate the SIM card, you buy RM100 to get 120days active period. At 121th day, you top up RM30 to get +30 days active period. Then at 151th day, you can choose SLL365@RM108. provided you don't spend your credit all the time. It is wasted if you top up RM100+ and immediately go fo SLL365.
[6] Wifi Hotspot is possible, subject to the internet quota you have (1GB from 12am-8am etc). I use phone-to-phone, I haven't tried using 3G/LTE modem.
[7] You can use M2U(Wednesday only)/MyDigi to get bonus but the bonus is valid for 24 hours (M2U-Wed), 72 hours (MyDigi). T&C apply.
[8] Sometime Lazada may give out some discount codes, you can top up at Lazada-Wisepay at discounted price, eg I spent RM80.10 to top up RM100 last week.

but the bonus last only for 24 hrs , the bonus air time .