Pensioner complaint- outstanding resolution 3 months

I am beyond frustration with FNB- my 83 yr old mother who lives abroad has been trying to resolve a request from FNB since the 29th July which has resulted in her SA pension not being paid since January 2021. The SA government pension fund erroneously placed her as deceased- my father passed away in 2019. We have needed documents signed off by FNB- all necessary documents have been submitted as per FNB requests with absolutely no resolution. I have visited a branch and logged numerous complaints and had numerous discussions with a number of call center staff- I have to repeat the same story over and over again- despite sending all complaint query information. In my complete frustration - I am now logging a complaint every day. I cannot even call her PMB branch- FNB does not allow this