CV21 changes call blocking
I have a OnSIM eSIM that when call out sends my Caller ID as my Virgin Landline number. OnSIM have just added SIP to there services and I now have a very unique but very weird problem. 
When I Call my VM landline from The OnSIM eSIM or SiP service I get no Ringing on the Landline (ring sounds on calling phone).  When I dial 1471 it says I’ve been called but if I pick up the landline during a call I get a dial tone and can make calls.  So the call is being intercepted somewhere in the VM network and not being passed through.  
It previously worked fine.  Can I get this new fault escalated to the advanced team please as obviously it’s fairly important to call my own landline from my mobile and have it answered.   
To confirm it’s a very specific problem when calling my landline with is own number showing as Caller ID from mobile / SiP it no longer connects. Dialing 1471 shows a call received and the landline has a dial tone during call attempts. So seems like there’s some form off new blocking system