@rodolpho It is a Latin word, and in my view the correct pronunciation is the original one -- the one you used.
I remember cringing on hearing a work colleague, who was knowledgeable in her subjects, refer to a variety of Pine -- Pinus Nigra (or black pine, translated), and MANGLE the Pinus as "Painus". Arghhhh.
Go try to tell anglos that is not correct.