I appear to be having the same issue. An old address is showing as my electoral registration. I've checked with my local authority and my bank, both have the correct address, and the address on my giffgaff account is correct. The incorrect details have been showing for about seven months since my electoral registration at the current address. I raised an issue with Callcredit, who say
“You already present on the ER as per evidence you have provided – you will need to update your current address on your GiffGaff account which will then pull through the correct details.”
Needless to say, that hasn't helped. Any tips? Thanks in advance.