By the way, you'll probably get a quicker answer, and make things less confusing, if you start a new thread, by clicking on the big yellow Ask a question button at the top of the Help & Support forum, rather than tacking on to the end of an entirely unrelated thread.
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Hi is your free giffgaff to giffgaff expired, you need to top up or buy goodybag not from your balance money but by voucher or card, at least once every 3 months this maybe why you are being charged. to check when you last topped up or bought goodybag check in your order history here https://giffgaff.com/profile/payment-details