80 ccd (1b)

Sir, An employee is covered under New Pension Scheme. He contributes @ 10% of his salary and claiming deduction u/s 80 C.(i.e., 80CCE)Now he wants to contribute additionally by opening another pension account through a nationalised bank to claim deduction u/s 80 CCD ( 1B) for Rs.50000/-. The banker says a person cannot have two NPS accounts and this will pose problem at the time of receiving back the amount. Please guide me in this respect.