Apple Watch code 106

[Birdiefan]

Anyone know how to resolve code 106 error when trying to set up mobile service on Apple Watch SE please?  
Was originally pay monthly on Tesco (O2), then Virgin (O2), now moved to O2 proper and received the cellular version of watch as a birthday gift, specifically to use with my new O2 package. What a let-down to find it doesn’t work!  

Any assistance appreciated. 

[pgn]

Error 106 used to be a known code on accounts moved into O2 from Tesco mobile - tagging @O2Georgina to take a look for you, @Birdiefan - watch out for her reply here after 8am. Good luck!

[Birdiefan]

Wasted many hours going round in circles with “chat” and 202 since my original post here last week.  No one at O2 wants to understand the error code issue or even sell me an airtime contact for my watch!  They all think it’s a different department, who think it’s the original department, who don’t think it’s them 🙄Is there help available here or am I expecting too much?  I’ve looked back at all other code 106 posts but don’t see a workable solution.  Or has anyone managed to purchase airtime for their watch and if so how?

[gmarkj]

We used to have some very helpful o2 advisors working on the community @Birdiefan .

Unfortunately this is no longer the case:

https://community.o2.co.uk/t5/Welcome-News/O2-Support-advisor-update/m-p/1634920#M40122 

That means that you have to persist with customer services on the phone or via social media.

Best time to call is just after 8am.

Call them on 202 or 0344 809 0202 if you were pay monthly, or 4445 or 0344 809 222 if PAYG (or use 0800 032 1402 if you have no other line, and you can use Skype for free - Guide: A Guide to Skype ).

Alternatively you can message on social media: 

Facebook ( https://o2uk.co/O2CFB) , Twitter ( https://o2uk.co/O2CTW) or Instagram ( https://o2uk.co/O2CIG)

[Birdiefan]

Ah ok, many thanks for taking the time to respond. Already tried DM on Twitter and raising a complaint.  Nothing back from either.  Facebook tomorrow otherwise it looks like I’m off to Three then.  Thanks again. 

[Al56]

Same problem here. I started a new conversation and was told to persist with CS - seems no point if they don't have ref code 106 flagged on their system. I was also told to try SM so I am in DMs with O2 but they are so slow. Looks like I will have to find out how to reverse out of the Airtime Plan for the phone and take my chances with 3. Thanks for the info on your post.