Estate not yet wound up from 4 years

Standard Trust Limited - 4 years since my father passed away and a simple estate remains an issue in winding up. From the consultants to the managers and even Heads of departments Cape town, Durban and Johannesburg- no service what so ever! It is disgusting. Every time I threaten to take this here or legal, I get another apology and nothing again. Before Covid they were already slow and needed a push to actually get any feedback so imagine what it is like now. I have spent time and money on calls that go unanswered, messages that are never returned. I am at my wits end as to what to actually do now. Their delays mean they are just debiting from the funds we had in the estate to cover insurance and there is the fact my mother who is a pensioner is paying higher rates as this property has yet to be transferred. Taxes etc all been done. No debts to settle. i just need to pay them so it can be finished, but I raised this matter of the extended costs due to their delays and they are yet to address me and also don't come back, as if this is supposed to just go away!

Please can I get some answers!!!!!!