Bad service at NFO

I have been in contact with NFO since 04/08/2025 with an issue on Postbank, Barry initially took charge and after numerous emails following up at times with no reply it was then assign to an adjudicator, Ms Tamareu on 20/10/2025 and to date there's been no reply. One would think this organization is the go to for solutions, but it appears not. Service and communication is bad as in the whole country. It's now 6 months down the line and no solution in sight. So where does the bug stops, who do we go to, to report the bad service of NFO.