Sometimes we drive till we miss the exit and this can be the scenario for this TD. TD miss Paya Lebar exit so the next exit will be Bartley Road East. It's quite common that we make this mistake but as long we admit in the first place and offer to deduct a little from the total fare, i don't think pax will question us much. If pax still KPKB, then you offer to drive them back to where you pick them up from FOC and ask them take another cab lo....
That is exactly what i did when the passenger refused to pay me the 'on-call'. After reaching his place, insisted that he did not make the on-call booking, so what to do, send him back to where i pick him up.