The first call came from an HR person who was pleasant and scheduled me for a second round of interviews. In the second round, there was a person from the US who was also kind and asked questions about the challenges I had in solving unpleasant situations with clients, how I solved those situations, described the workplace and what was expected of it. The third round was with a person from the UK who had a set of questions related to customer support, the questions were very interesting and serious. All in all, the talks were pleasant. The only drawback of the whole process is that you did not inform me that I was not selected, neither by email nor by phone. When someone interviews you for customer support, then certainly one of the first rules is to answer back.