wadow, mengelola tagihan gak pake software billing (pake excel aja, atau pake sempoa??? bener2 baru denger )..........itu sebetulnya providernya TOP MARKOTOP bangettttttttttttttttttt harus diacungin jempol. salutttttttttttttt buat providernya !!! wkwkwkwkwkwkwk
saya tambahin 2 JemPol Tuan