ASSISTANCE WITH CUSTOMER COMPLAINT

Where can a person report the Standard Bank Customer complaint line. My complaint was logged on 4 Feb 2020 (via email) and has been assigned to Mirriam Thubela, with ref nu ***. Until today this complaint(s) has not been resolved. She READ my feedback/follow up on 28 Feb 2020 (also via email), and have still not assisted in ANY way to resolve the issue of pathetic service from Bafana Makhubo at Direct Channels Sales| Standard Bank Customer Contact Centre. Please advise who can I contact next???