I woke to an email from BitStarz support informing me that they were able to confirm that the card I used was/were prepaid and I was paid in full following the submission of my proof of ID.

I also want to thank everyone that helped me, your replies on reddit and private messages were extremelly appreciated. I was made aware earliet today that a few users contacted BitStarz regarding my withdrawal. Thank you very much! The bitcoin community amazes me.