Is it wrong to say "Subhannah wa Ta'ala" instead of "SubhannaHU wa Ta'ala"?

I have just realized when researching there is a hamza with fatha in Subhannahu ( سُبْحَا**نَهُ** وَ تَعَالَى) because anytime I hear someone say SWT, I never hear a distinct "hu" and instead they just say Subhannah wa Ta'ala. I don't know arabic but I want to say it how it should be said/correctly, even if it's not a sin.