Discovery Bank Not acting in their Clients best interest

I opened a black account at Discovery Bank. I was impressed with their offerings. They then enticed me to get a credit card by offering me 5000 miles and more benefits. It seemed great, but on opening the credit card they took all my spend on my debit card exercise points to miles away from my debit card, which at that point I still had not received my credit card. I have spoken to their service agents Nandi, Bashani & Shrivor to help sort this out. I just don’t seem to make any progress. I getting a bit worried about transferring my life saving to Discovery Bank if they don’t act in their clients best interests. Let’s see how this plays out, I have ceased using the account and will make a decision with the next week as to whether I stay with them