Apple Watch series 5 reference code 30

[Sam15]

I’ve been using an Apple series 3 watch on a data plan, I bought the new series 5 watch from Argos and tried to set the mobile data up, when doing this is comes up with ring 202 and state reference 30, I've done this but due to the lack of staff the ones that are working have no idea what the issue is. Anyone else had this issue and is it an easy fix? i set the old watch back up and the data will set up straight away but for some reason it won't take to the new watch?! 

[MI5]

@Sam15 

You need to call customer service to remove your old watch from your account Guide: Coronavirus Community Help and Support