eBucks Cheats and Refusal to assist

I have contacted FNB to update my last name on several occasions. The first time being when I called them and they advised they need my marriage certificate and my new ID to update my last name. I then went to the bank with my husband and the agent there updated all the details including my marital status yet my surname has not been updated. Since then I have had several chats and emails where I have advised them that they have the documents on file yet they insist I send it again after they sent me away from the branch twice because my documents weren't correct. I can't help but think FNB's system have been compromised and someone is just trying to get my information. Then there is the eBucks problem. My husband has a Cheque account with them and I have my own card linked to this account. Yet when I use my card, neither he or I get the eBucks for the relevant transactions. I have raised this with them and have been given conflicting information on SEVERAL occasions! All I want is for the eBucks to be allocated as promised and they simply refuse to assist. I don't care if it comes to my husband's account or mine but is it too much to ask for a company to give you what they promise? FNB should change their slogan because "How can we help you?" Is simply just not true and to top it off this is the Premier Banking division messing me around... Premier Banking that I pay extra for! Right!