Did they appeal? I know one family their visa was refused from Dhaka. Dhaka VO took 5 months to call interview.suva said:welcome bro, be well prepared. one of my close relatives got refused after interview even though they were 100% genuine. now they r living here in bangladesh. approval rate for SG vo is only around 55%. good luck
I have know two families their interview waived.
Just praying for me not to have interview. I wish, i will visit Bangladesh next Jan-Feb and praying for my wife get visa without any interview but it is still in dream.