Barclays has 24/7 instant chat, so accents are not an issue plus you have it all in text and a copy of what was said.
I would have thought in this day and age text would be the first choice of people, rather than picking up a phone.
Barclays premier also has dedicated 24/7 chat, without the need for you to have to log into online banking or the app, and if you search the barclays website for the number for premier you would have been presented with the instant chat option.
However I don’t think the fact its a UK call centre or abroad has any relevance to banking and how good it is. How often do people actually have to contact the bank.
I want good customer service and Barclays offer that, although I nearly always use the chat option. Because I like having a record.