Inconsiderate to supporting documents

I am quite disappointed at how Capitec Bank operates; I am a newly wed who is still busy updating from my ****en surname to that of my marital surname I went to two Capitec Banks in Kriel and Lephalale Mall on different occasions and i found dealing with them very unpleasant to a point that they refused to help me because my surname on my ID (Marital)and other documents e.g Water and Light bill/Bank statement have my ****en surname which i always attach my Marriage Certificate to show that i was once this surname now i am this surname but they refuse to use it saying that Capitec Bank doesn't take such into consideration and it is the first financial institution that treats newly wed women like that cause I use my marriage certificate as proof and it's not a problem.