I have replied on your other post with some links for you to check.
It's best to stick to one post,that way you get the best help.
I think you must have added credit rather than buying a goodybag.
Credit is used up very fast with data usage.
I think the best thing to do is contact an agent and explain that you are new and have mistakenly added credit instead of buying a goodybag.
They will decide if you can get a refund.
Agent replies will be here,usually within 24hrs