He'll be with Sitel. They're a contract call centre outfit who took over VM's retentions activity last year. Good to hear that you had an excellent experience. Whether use of the Plymouth site is a long term thing who knows, it may just be surge capacity that Sitel are providing because of the large number of calls generated by the price hike.
It would be nice to think perhaps VM would bring back all customer support from the armpit of the world and have it provided by Sitel in the UK, but I can't see that happening this century.