Survival at old age

I retired from a non-pensionable job of a sector corporation in 1989 when my basic pay was Tk 5,700 per month in the national pay-scale against Tk 6,000 in the highest pay-scale prescribed by the government. I got Tk 8,00,000 as total retirement benefit.
I am worried like many of my colleagues who retired at the same time as I have to survive till death by investing the amount of retirement benefits.
I invested the money by purchasing 4,000 ICB units while I got Tk 1,00,000 in cash as dividend for a few years. Then came much-awaited democracy and I could get hardly Tk 50,000 as dividend against those 4,000 ICB units. How is to explain such debacle?
I also invested the money in the public limited companies (PLC) but following stock market scandal of 1996 and 2010-11, my investment became unproductive. It rather lost a considerable amount of money unfortunately.
Nothing happened to those stock market manipulators though persons responsible were identified by an enquiry committee. The concerned minister found them too powerful to take action.
Bangladesh is becoming a middle-income group country by the year 2021 and considering the price hike, I am extremely worried as to how to survive in future at old age. Should there be a proper  government policy, non-pensionable employees could survive with income from investments.
Mahmud Ali,
138 New Eskaton Road, Dhaka