Unprofessional Service

Their complaint resolution centre is very useless. Joseph Witticker is busy ignoring my emails and phone calls. And Joseph also told his friend from credit card division to insult me. He called me then asked what work do I and where did I study and when I answered he said he doesn’t believe that because it doesn’t seems so. This whole issue is happening because they are unable to answer my questions regarding interest charged on my credit card and I don’t know why they are not escalating this to their mangers. They can’t treat like nonsense and call me names.