Iphone 5 was sent to get unlocked but 'sim not valid'

My phone was given back to me on wednesday the 21st Januray after giving it to get unlocked on monday 19th january. The phone was locked to vodafone and now should be on giffgaff and unlocked to all networks.

The guy said it can take upto 3-5 days for the phone to work with the new giffgaff sim, it is not the 5th day and it is still not working and it says

SIM not valid - the sim card that you currently have installed in this iphone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iphone. Please insert another SIM card from a supported carrier or request that this iphone be unlocked by your carrier. Please contact apple for more information.

When i take the sim out, i am able to use the iphone in terms of going onto apps and only using wifi but it says no service due to no sim being in the phone.

the carrier on the settings says giffgaff 17.0 which is why i think the phone should be unlocked but is not working

i have been advised to 'reset network settings' but im scared this might lock the phone back as the phone is unlocked

what do i do?