Poor service from Standard Trust

Standard Trust was nominated as executors in my Dad's will. After much delay, they appointed an executor to administer the estate. It would appear that they use freelancers and do not monitor the status/progress themselves. The feedback provided is non-existent. It appears that action is only taken when I request something to be done. I tried to contact the appointed executor in January on to find that he no longer works for Standard Trust. Standard Trust did not notify me that this had happened. Standard Trust is not responding to my emails. At this point, I have no idea what the status of the estate is. I would recommend that people who nominated Standard Trust as executors in their wills amend the clause.