Tymebank holding up deceased Estate

My father had a account with Tymebank and he passed away 5 months ago. For 4 months the lawyers have been writing to Tymebank to have the account closed, the funds transferred and the IT3b sent. On each occasion the call centre assures them that the matter will be dealt with within 24 hours. Emails have been sent by the lawyers. I have phoned as well (as daughter and executor of the Estate) to get the same response. They promise that someone will phone back within 24 hours. This is the ONLY thing holding up the Estate to be finalised and it so frustrating. Looking at all the other reviews, it appears many other people have the same issue and Tymebank appears not to be responding to complaints. I am not sure where to go next - ?banking Ombudsman?