Bad service from standard bank

My father passed away during the level 5 lockdown period. when level 3 came into effect my mother went too standard bank to close my fathers account but was turned away due to her age and not sure which restrictions. "Interest is occurring and bank fees are being charged for an account that is not in use." i emailed standard bank to enquire how to proceed with the matter and was advised to contact late estates with no feedback. its been 10 months now and we received a letter from the bank advising that my father owes on bank charges and interest. My mother went again during the level 1 and when the consultant saw the letter they told my mother to go to high court to resolve the matter. so its standards bank account and we need the high court to resolve the issue. i mean what type of service is this. how can bank charges even increment if there are no activity, couldn't this be picked up as well. i need someone from standard bank to contact my mother to resolve the matter as standard bank in eldorado park is *********** in resolving such issues.