SINGAPORE, May 28 -- When Neelkamal Semwal took to LinkedIn to air his grievances with Singapore's DBS Bank, he probably expected the usual corporate silence.

What he did not anticipate was a personal reply from the bank's chief executive - while she was on a plane.

In a now-deleted post on Wednesday, Semwal vented his frustration after nearly three weeks of unresolved technical issues.

A service allowing customers to register their NRIC with their DBS account had been non-functional, he said, leaving him unable to link his FIN to PayNow for a tax refund from the Inland Revenue Authority of Singapore.

"I wonder what's wrong with DBS Bank Singapore but neither their customer care nor their app development team seems to be sincere about...