The i in your pei shan't be there, the sound is a flat peh. All of the syllables are flat sounds, hah-lah-peh-nyo.

SMH. Claramente no entiendes español.

Pein, not pei.

It's not "peh," it's "pān" unless you're a gringo.

If you want to get technical: hæləˈpeɪnjoʊ, hä″lə-pān′yō, or xa.laˈpɛ.ɲɔ.

FYI: "Shan't" means "shall not," not "should not." Maybe don't use archaic language if you don't know how to use it. ;-)