某出口公司接日本银行开来的不可撤销信用证有下列条款：“Credit amount USD50000，according to invoice 75%to be paid at sight，the remaining 25% to be paid at 60 days after shipment arrival.”出口公司在信用证..

某出口公司接日本银行开来的不可撤销信用证有下列条款：“Credit amount USD50000，according to invoice 75%to be paid at sight，the remaining 25% to be paid at 60 days after shipment arrival.”出口公司在信用证有效期内，通过议付行向开证行提交了单据，经检验单证相符，开证行即付75%货款，计37500美元。但货到60天之后，开证行以开证人声称到货品质欠佳为理由，拒付其余25%的货款。请问：开征行拒付是否有道理？为什么？