Hello,
It seems to have rectified the issue with making calls but have not had the opportunity to test it much today. Will come back to you in a couple of days after I have monitored the phone.
It's disappointing that I have had disruptions for over the last 2 or 3 weeks and as I said my phone was unusable yesterday.
I would ask therefore that a credit is applied to my account but firstly let me see how I get on over the next couple of days or so.