Thank you for contacting the GiffGaff Community. Hopefully the following information will help to assist you further.
It sounds like your account has been hacked!
I have tagged this@report_phishingso a GiffGaff Educator(Community Giff-Staffer)will make contact with you shortly via Private message to discuss this with you, they will also comment on this Forum Thread too. Their message to you will goto your private messages, which you can check here https://community.giffgaff.com/t5/notes/privatenotespage
Please forward the text message you have received to 7726. You will not be charged for reporting these texts.
Paul here from the giffgaff community team (giffgaff staff)
Sorry to hear about your issue, I can see that you have already raised an agent case and what I have done for you is nudge them for you . One of our escalations team will be in touch shortly (if not already) here: https://giffgaff.com/support/questions
Please change your giffgaff password, you can do this directly here: