Inconsistent bank

Standard Bank business banking has got to be the most atrocious business banking ever, I opened my account only had to chase them to get them to open it, then went to the branch but was still given a business banker who is not anywhere near me, asked them to change this, no word about it, email your banker who gets back to you in their time, payments get made via standard Bank into my business account fortnightly, yet some payments clear instantly and some don't, then you call, you are told call you business banker, who apparently you need to email first, before calling, cos the number does not go through to them, when you call or email, they say busy with another client to wait, this is the type of service offered to clients, the payment made from STD bank to std bank take 2 to 24 hours, but also can clear immediately, now as a business you look ***** because of this inconsistency because you standing infront of people who you need to pay and can't because the payment has decided not to clear, this is causing reputational damage to my business. Also noting I have proof of an agent telling me about the inconsistency, yet every other bank if paying from the same bank clears immediately, I get payments from the main contractor from the same account fortnightly but STD plays games with you and intentionally makes you run around, the service is nothing short of non existent