ABSA unfair listing

I had an account ********** 427 with ABSA which had an overdraft in it. The account was handed over to MacRoberts for collection which I have been paying through them on agreed arrangement. I notice the account was recently listed as default on XDS, Experian and other bureaus. Prior to listing, I never receive any notification about the listing on credit bureaus which violates my rights as a consumer. Can not afford to retained this listing in my credit record due to unfair listing.