Bad service from Discovery Bank

Since my Discovery Card moved to Discovery Bank it has been impossible to use the card or even now to pay. Cannot add their Bank Details to my personal FNB bank account. They do not even have my correct details on record. When you try and phone (tried 4 times) you go through their system type your ID etc. only to be cut off when trying to speak to a banker? How do you deal with a bank that you cannot phone or e-mail. This is pathetic service to say the least.