Hi there @syeddhon
Oh no.....why do you want to leave Giffgaff..? it would be a shame to see you go.... are you sure you have exhausted all avenues to get your problems sorted out...?
If so and you still want to leave, here is some information for you to read first
and you can also request a PAC code here to port your number away from GG.
or ring 43431
If you port your number away from gifgaff all will be lost including any credit,goodybag and PAYBACK..! earned the account will close and the sim deactivated.
Only when the number has been fully ported out can you then activate another sim to the same account as if you were starting from scratch.
In order to close the account you will need to use all your credit and/or goodybag.Then either port your number to your new provider or destroy/ignore the sim. You should also consider removing any credit/debit card and personal details. https://giffgaff.com/profile/payment-details
Good luck with your new provider.
We hope to see you return in the near future.