accidentally bought a gigabit but I need a goody bag

How do I change immediatly to a goodybag when I have a gigabag currently in use??

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Hello there,

Since you've purchased a wrong goodybag, all you need to do is contact giffgaff agents from here: https://giffgaff.com/support/ask

and they will refund it back. Refund cannot be processed from here. You'll get reply from giffgaff agents within 24 hours