Standard bank customer service sucks!

I have a business account with Standard bank, I got a new Cell nr in January, but up until today, I dont received my notifications, i have reported it to so many people different platforms! I get some random persons transactions, but only a few of my own! I am sooo over it, anyone can clear my account and I will not be aware until I go onto my businesses online! Which is also the worst banking app ever! My transactions doesn’t come through as i make them, some will only show a few days later, so if someone swipes my card, I will only see it a few days later! It does not follow up on one another! I dont know who else to contact, its been 4 months, and NO ONE CAN FIX THE SMALL PROBLEM?