@katie200
I'm a little confused by the situation you are describing, mainly because "bonus credit" has a number of possible, although related, meanings.
Is it bonus credit that you have been awarded for topping up by a specified amount within a specified period? If so, the offer should have described the basis on which it would be applied to your account, but the general rules are set out on http://www.vodafone.co.uk/terms-and-conditions/consumer/mobile/pay-as-you-go/bonus-credit/
Alternatively, bonus credit can be got by redeeming Rewards Points which you have "earned" through topping up. If this applies, you will see a basic description on https://rewards.vodafone.co.uk/catalogue , and additional details will be given before you confirm that you want to go ahead with the Rewards Points redemption.
If you have a Freebie Data, the 500MB of data will have been applied to your account; it sounds as though that is probably what 2345 was telling you.
Your online account, which can be set up at https://www.vodafone.co.uk/myvodafone/faces/oracle/webcenter/portalapp/pagehierarchy/Page2.jspx if you haven't already done so, should show you more details of all these items.
If you can give a little more detail about your situation, someone may be able to advise you further.
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