Genpact — Pf trust tfr

I joined Genpact in Dec 2007 and left in March 2013. At that time this UAN thing was not there... I again joined Genpact in July 2018 and now I have UAN, I raised query to transfer of my old pf to UAN linked new Pf account but Pf team is asking to apply for new UAN. Having two UAN is illegal. And I don't understand the logic of applying for UAN when I already have UAN