Currently there's 3 active Ambassador plan to choose :

1- Ambassador (PPU plan with Free RM50 DG-DG)
2- Ambassador PP 68 (Unlimited Calls, 15GB Data, 15GB Music Freedom, Unlimited Whatsapp/Wechat and 4GB rollover (VoIP useable on main data))
3- Ambassador BB 70 (40GB Data + 10GB + 10GB (VoIP can be purchased as add-ons)

Free RM50 calls and sms to DiGi other then DiGi 0.13cent/mins (30sec block) and 10cents/sms.
This plan comes with Monthly 0mb data (1mb fast data and unlimited slow data)
- Still usable on whatsapp texts msg but there's delay on sending and receiving msgs.
- You can subcribe monthly Internet plan.

This plan only cater for those who dont call much.

Calls and SMS
Ambassador Plan come with FREE RM50/month credit for DiGi-DiGi usage. (Calls/sms/mms)
Calling others telco mobile or fixed line cost you 0.13c/min (30sec charge block) or special number chargeable based on current Special numbers rate (60sec charge block)

Mobile Internet
Ambassador Plan gives u Free Monthly 0MB Basic Internet (Capped speed) For MyDiGi usage.
You can purchase MI (Mobile Internet) in addon section if you need speedy connection.
Once you purchase any Monthly Mobile Internet your FREE Monthly 0MB basic internet will be cancelled and you'll not to purchase Monthly 0MB Basic Internet again.
If you happen to cancel your Monthly Mobile Internet plan. You will not able to online (Disconnected from Internet) until you purchase any offered MI plan again)

-RM10.00 chargeble on your 1st bill.
-Zero Commitment
-FREE RM50/m for DiGi-DiGi (Calls/sms/mms)
-PPU on Mobile Internet plan (Hourly/Daily/Monthly)
-PPU on calls/sms/mms to others telco
(PPU - Pay Per Use)

Cheers.

This plan comes with 15GB all day data and unlimited calls plus unlimited whatsapp/wechat.

For ambassador or normal line ?

Omg 

I registered my ambassador plan too thanks to bro megat_johan and my billing date is 20th every month.

That what i have been saying back then,my  calculation for, Ambassadorian the option of sub bb100
As long you have a ambassaor voice plan, sub that bb100 for merely rm90 as sub account and enjoy all the EXTRA promotion for at less 3 months...
even Stream free also 50GB

just enjoy for the 3 month and think LATER about whether can still get ambassador bb70 after that
3month is still a long way, by then..could be another form of NEW promotion
But i do believe as long you still have zero commitment or bb68....you will still able to sub ambassordor bb70 anytime.

Ambassador BB70 for now is not worth as compare paying to bb100 by paying extra rm20 montly
you will get to enjoy at less 3 month

Extra Quota
Free Stream extra 40GB
Promo plan..Total extra 20GB
3 month promo...Total extra 18GB

total: 78GB for paying extar rm20..

yes..

The "Stream Free" 50GB is permanent or only 3 month promotion?then change back to 10GB?

It need breakdown a bit as i found something not goes correctly.

1. Promo 10GB base internet
2. Promo 8GB Stream on demand. (this stop consuming when 1 was finished, usage will go to 3)
3. 10GB Stream on demand.
4. 50GB Free Stream
5. 40GB Internet (Hopefully the 10GB X 12 months was added here, I didn't visit DIGI store this month @@)