It's okay. For a long time, I had no idea how "vwala" was spelled, as I'd only ever heard it spoken, never seen it written. The first time I encountered it in written form, I thought it said "viola" and wondered if there was some alternate definition or something.
So now, just to be silly, I say "viola" sometimes instead of "voila". Insert the key, turn the knob, and "vee-oh-lah" the door opens!