Very poor service! I...

Very poor service! I downloaded the Discovery Bank app, try to register...i was informed that i was already registered. My email address where i am receiving all their emails on is apparently not my primary email address??? I phoned the customer care line. Gave all 3 emails that i would/could have used and none is the correct email. I was informed that i cannot be assisted to update my details although i confirmed all my other personal information. This is bad customer service. If you not want to assist, just say so.