Why so much ***** and no detailed investigation

***** reported on 2020-05-28. Requested full investigation and feedback. Made numerous follow-ups over more than 2 weeks - waiting up to 25 minutes to speak to someone, getting calls dropped etc. On 2020-06-15 received email to tell me they have tried to contact me - once in more than 2 weeks - that is the effort they are prepared to make. No detail on investigation. Third ***** case on my account in less than a year. I need detail. Every time I get treated like a ******** and have all the inconvenience yet FNB does not think it is necessary to give me full feedback.