They've started to follow a Singapore trend of limiting non-fraud phone customer support to between 8am and 12 midnight [1], which IMO is ridiculous and counts strongly against their "customer service".
I also thought that their counter staff tend to be overwhelmed and overworked, because DBS, as they bought over Singapore's post office bank [2], also acquired a lot of (now) elderly customers — I believe still a magnitude larger than other banks.
[1] https://www.dbs.com.sg/personal/bank-with-ease/contact-us
[2] https://en.wikipedia.org/wiki/POSB_Bank#Acquisition_by_DBS_B...