We're sorry to hear that your Foodpanda order was unsuccessful. Before you re-apply the voucher code, kindly be informed that Foodpanda voucher has a 20 minutes of reactivation period.
Below is a reference from Foodpanda's Help Center:
If you need further assistance, A+ Rewards are happy to look into this further for you. Please submit a ticket to us by following the steps in this article:
https://support.tngdigital.com.my/hc/en-my/articles/4407437809561-I-have-submitted-support-ticket-for-A-Rewards-how-do-i-track-it