Terrible DIFY Premium Support. Please IMPROVE!

[ipodster]

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Please upgrade your support system for DIFY premium on AWS marketplace!!!
The licensing checkout system is so confusing that I ended up paying for 2 duplicated licenses.
I opened a case on AWS support for refund, was asked to contact DIFY instead.
Guys at DIFY seem to struggle with how to properly refund a duplicate transaction.
A few days passed and nothing is completed.
AWS then asked for seller to quote refund ticket reference for matter to resolve.
Guys at DIFY said they lost the ticket reference. What the hell?

Now DIFY had to re-submit refund ticket.
Meanwhile my original site where rightful license is installed is no longer accessible.
What the hell is happening?
Can't you guys sort out a simple matter?