Just added an apple watch to my account - not able to make or receive calls from my number

[IT_Engineer69]

Hi everybody,

I've added an Apple Watch SE to my account today, and after setting up the plan I'm no longer able to make or receive any calls from BT landlines or anywhere. Calls to my number don't even hit voicemail so something sounds like its royally screwed the pooch.

All I can do is send/receive texts

I've got access to some logs from calls made from work to my mobile number and they literally all fail with SIP 503/temporarily unavailable

Is anyone else having similar issues or not? 

Have tried phoning but the calls drop whilst I'm speaking to a customer services rep and live chat haven't provided any answers as they drop out too

Thanks

[Ij4]

Same issue for 6 days. O2 Technical team are taking way too long to deal with this