Hi your goodybag allowances only cover UK landline numbers that start with 01, 02, 03, and UK mobiles starting with 071 to 075 and 077 to 079.
Landline and mobile numbers in Jersey, Guernsey and Isle of Man are NOT included (these are outside of the UK)
Any calls made to 0800, 0808 numbers are free on giffgaff,
Here is a link to help you
Also you can see your goodybag here and if you are being charged here
also is the phone unlocked or under 02 network
Hope this helps you
Is the 'spare' phone known to be working and unlocked?
What do you hear exactly if you try to call each of these numbers:
What exactly do callers to your number hear ?