Ted here from Shopify, thanks for posting your query!
I'm sorry to hear that you've received a chargeback, they are for sure a nuisance to deal with. If you have already closed the account, can re-open the account on a trial basis so you can submit your chargeback info. I'll send you an email now to help authenticate the account and take a closer look. Please reply back to my email when you have a moment.
Thanks for letting me know. I received your email and replied back to you the 1st of Feb advising that I've added a 5-day trial to your account. Was there another email you sent after that? If so, did you receive a new support ticket number after the email was sent? Were you able to access your account since then? If not I can add another trial to the account.
Our live chat, email and callback support are also available here 24/7 if you would prefer a faster response as our Forum Community is not a live channel and so our response times might be a little delayed.