Try checking on you Account Overview, on the left side see "Refer-a-Friend Reward" it should have ($1) for every friend you refer using your unique code. Other option is try checking it another day maybe it will be updated on your account.
I think the 5gb bonus data are only for newly activated customer that registered their email and activate that email on January 15 as part of their boxing week sale. If you will use a lot of data in regular basis, maybe you may consider to upgrade on...
I believe you will charge full, then that would be your bill cycle, every mid of the month. So even you pay in full, it will cover a whole 30 days period of load.
