I had same problem. They told me it's too loud in there to answer phones. Then maybe have a place to go where you can or st least return calls before you open. I ended up emailing through website. Should not have to do that.
You can email them through their website. But I called just to check and they picked up right away. Your probably calling the wrong number.
Wow, that's bad business. My suggestion would be to go there ASAP. Get clarification before the scheduled party time. Maybe have a back up plan. My kids always liked Peter Piper Pizza and a park party is always fun.
Thanks! Your answer is awaiting moderation.