SubStandard Bank

Opened a business account with Standard Bank as a hunting outfitter. Had hunting clients in March, who were invoiced and had to pay their money via EFT into my newly opened Standard Bank Business account, from their banks in the USA. Clients paid promptly, on 20 March, and the money was cleared into my business account on 21 March. Standard Bank promptly an immediately froze my account, stating that they funds needed to be checked for legitimacy and funds apparently need to be confirmed. After several attempts to get the issue sorted, my business banker, who for now shall remain nameless, has shifted over the responsibility to me and my client to contact his bank to communicate with her about these funds? I am perplexed as to what she is then there for? She also refuses to give me a contact number so that I can phone them and discuss the issue personally to sort out the situation ASAP. I have gotten no help and no effort from her to sort this dire situation, and I have to pay my suppliers with the money which reflects in my account, but I have no access to. This could have dire consequences for my business as suppliers may not want to do business with me after this due to slow payment, which is the fault of the useless person assigned to me as a business banker, and by default, the fault of Standard Bank as she represents the brand. Is there perhaps another bank I can use for business purposes, because this is not something I can go through every time a client of mine, pays me via EFT from another country as the nature of my business is to sell hunting packages to hunting clients from foreign countries.