Standard bank block my account for R300 i told them i'm not comfortable accepting 3rd party payment why do they act this way?

Standard bank block my account for no reason , I called Standard Bank officially to inform them that R300 was sent to me and im not comfortable with the R300 in my account because it was a 3rd party payment that Standard Bank should hold the money or refund to the sender as I don’t accept 3rd party payment because of suspected *****. The next day my account was blocked , maybe the person who answered the call did not understand me , I don’t know why, is it bad to inform Standard Bank that you are not comfortable with a transaction ???