FNB SPAM Caller, Put phone down in my ear 12 x Gatvol!

FNB Card is trying to reach me, I wait for their call, They phone me 12 times each time I answer then they put the phone down, As it is automated I sugest you follow up with your IT department as I really do want to speak to fnb card but each time they phone the line drop. I want it fix so we me converse on the card topic. What is wrong is this practice or tactic. Please phone me contact nr, it is rude to drop the call each time. Best regards Unhappy FNB Customer... Also Complains on your app says System Unavailable, Is anything working over there?