I'm sorry to hear that. I've requested assistance from our team regarding your concern with the delayed work submitted. One of our agents will reach out to you directly via a support ticket and assist you further.
re: "I need to contact customer support for delay in designing my post card. Please do not Pay ."
That is not how this works.
This is the Community Forum, where you may ask questions and seek advice.
You can't simply hire a freelancer to do some work for you, and then post something in the Community Forum and expect that you will not be billed for the work.