Discovery Bank treats Secondary Card Account Holders like 10th Rate Citizens !

I am a secondary account holder with Discovery bank credit card. My husband is a Primary Account Holder. He does not make any purchases as his Discovery card has never been activated and does not work at all. I have a credit card in my name and as a secondary card holder do all the household purchases on Discovery credit card and all the online purchases, OTP's are delivered directly to my phone to allow me to do these purchases. However, I have no rights to access banking information if I call the Call centre, i.e information regarding refunds or purchases etc. I have asked for signing powers to allow me this access, and apparently the Bank does not have this facility. This is a disgrace. I am thinking seriously of closing down my account with Discovery Bank.