Terrible experience from a Simply Asia fan

I ordered from Simply Asia Atlas Mall via the Simply Asia App on 31/12/2023 at 18h55, payment was made and order was accepted. Made my way to the Store only to find the store closed. Asked the security guard what time the store closed as it was listed as open on the app that day, athe security guard said that they were not open at all that day. Tried to contact Simply Asia via the Help Portal on the App but due to it being a public holiday/weekend no agents available. Went on the App this morning just to find out that the order is still "in progress". So it's a day later but I can't do anything about my order, can't cancel it vi's the app, the store is closed so they're not answering calls, can't contact an agent to rectify this error. It's so frustrating that the Store was incorrectly listed as open and I could place an order but the app isn't designed to recognise the fact that the order is not being processed after 12 hours and I have to sit and wait for another day until the store opens to speak to someone about my refund.