Extremely bad client service feedback

My partner passed away almost 7 years ago. Yes, his estate was a complicated one and in the first year, received adequate attention to the "easy" settlements but thereafter, not much attention is being paid to the outstanding issues. I even involvied the Trust divisions Head of Estates to try and get issues followed up and resolved sooner, but even that doesnt seem to have any impact. My constant requests for updates are constantly being ignored. They are extremely frustrating!!!!