Shoddy service from Mercantile Bank soon to be Capitec Bussiness Bank

Over the last month I have been through hell with Mercantile bank as I have been expecting payments from an online website that my husband and I are trading on and the bank keeps returning them. This issue has in fact been going on for seven weeks now but initially I was trying to sort it out myself however I eventually approached Mercantile for help as I was not winning. The crazy thing is that we have been receiving payment each month sometimes twice a month from this same business into this very same account without a problem for the past 6 months so they should really be able to get to the bottom of this issue. We are so dependent on these funds after our principal business suffered a massive blow due to it's dependency on tourism which makes the sorting out of this problem all the more critical. Every week I keep getting messages from this platform that we sell on saying that our funds are on their way and as I know that they take a few days I have been getting on the phone to reassure our suppliers that they will be paid soon, of course now I've completely lost credibility with them as the funds keep being returned!!! It seems to me that the problem lies strongly with the team that works behind the scenes as the consultant that I have been dealing with is constantly waiting on them for a response. This morning I went into the branch to ask if it is possible to link a PayPal account to a Mercantile account as I am in the process of setting up another website for which I will need Paypal, however after waiting around 15min to hear their response it seems that they didn't have an answer for me as the backend team didn't have an answer once again. If this issue isn't resolved within the next 48 hours I will have no choice but to close my account which is a pity because up to this point I have been happy with the service I've been getting and so much so that I have been recommending them to other small businesses, I now feel that that may have been a big mistake mistake.