pleaseansweryourphone

Hello, I want to make a voluntary payment from overseas to my national insurance contributions for "payable gaps". but every time I call the centre and go through the steps, you hang up the call. How am I supposed to pay it if I can't call you? Could you not just allow me to make the payment online with my debit/credit card? You already show me how much money I owe for incomplete years, so why can't I just pay it with my card? It would just be much easier for everyone if I could do it like that.