Firehouse Subs Coliseum

I placed an order on the Firehouse app and waited for it for quite some time. Went into the store and they advised me that they could not provide my order because they had no gluten-free bread on hand. I asked for a refund and they told me that I would have to obtain that on the app. There is nowhere on the app to cancel the order and I have attempted to call Firehouse main number or customer service issue number and I receive a message that their phones are out of service or something's wrong in regards to contacting them. I just want you all to know you might not get your money back if you order on the app