I don't face with such problem though.
I haven't really gone through BB plan yet, give me some time I'll digest the content later and see if I can help to answer your query. However, if anybody knows the answer, kindly answer to this query.
No longer being offered. For now is RM 30, it is a fee and not credit which means RM 30 will be deducted from your credit as a fee.
Nevertheless, in order to subscribe to this long life plan, you need to switch to the latest prepaid plan. The details of the plan can be found here: http://www.digi.com.my/prepaid/callplan/index.do