Apple watch setup mobile data issue , Code 28 [ Edited ]

[AndreiXpert]

Hello
Trying for the past two days to activate my cellular apple watch and nobody seems to be helpful.
All i get is people that pretend not to hear me or calls dropping and even others getting me to buy extra sims for the apple watch )) (wtf?!?)
The problem is simple , read all the steps and errors people were getting in the past , mine is a bit simpler , I press on setup data plan in the Watch App , get to the point where i need to login , i am doing that and then straight to Error 28 , contact o2 and quote this error .

Ideas ? O2 customer support doesn’t have any , besides sending me esims (i’ve got 3 already and 2 more are on their way )

UPDATE 1 : Just got a text from o2 saying "the error code on your watch means that your bill needs to be paid up to date thanks was unable to call you back dialling issues" ( wtf? , bill issue date is in 7 days , nothing to pay atm ) 

[MI5 Level 94: Supreme]

@AndreiXpert 

I'll ask @O2Simon to assist you.

[AndreiXpert]

Thanks . Will be around

[MI5 Level 94: Supreme]

@O2Thomas may also be around now......?

[O2Simon · Accepted solution]

@MI5 Thanks for the tag @AndreiXpert will private message you reagrding the issue.

Thanks

O2 Simon

[AndreiXpert]

@O2Simon I am here and waiting ) if you manage to untangle this you are the MAN )