Hey I just found when you buy a bond you get credit in which you can save up to buy bonds. I was wondering if this is true? I have spent over £100 on bonds since playing OS but checked my Google play balance and it says £0 in balance? Why is this?
Check that your Google rewards account (Play Store) is linked to the same email your RuneScape account is linked to.
You won't be able to earn credit for previous purchases but, as long as you link your Google rewards account to the right email, you should start to earn credits in the future.