Appalling (non)service from Bidvest Bank

I had to sign annual mandate forms to receive payouts from Airbnb. Each time I filled in the mandate forms (which I felt I had done correctly), I received an error message indicating that Airbnb was at fault and I needed to contact them to change information on their side. I have reached out to Airbnb and they said the problem is on Bidvest's side. I have mailed the a couple of times asking for assistance. Since 14 October no one from Bidvest has made an effort to reached out. Their service is appalling, or should I say non-existent. In the meantime I decided to reload bank account details on our Airbnb profile in the hopes that something would change. Yet I have the suspicion that the fault is on Bidvest side and the decent thing would have been to send a mail indicating as such.