Orders disappeared after unlocked account

Hello everyone,

I would like to discuss with you what happened to me recently with Amazon while my account was locked.
I woke up 2 days ago and I was no longer able to access to my account. Later the support told me it was due to an error in a billing address on one of my credit card linked to my account, and as result my account was locked.
Amazon didn’t let me login to my seller account (even if the problem was related to the buyer account) and I didn’t receive any email on what I should do with my orders, in effect I was not able to receive email from customers and Az claims.
I sent a couple of email to seller support to know the guideline that I should have followed in this case with the orders and since no reply was received i assumed that all the orders that weere “unshipped” up to my last login had to be shipped.
Since i had no access to the account, all our systems that access the account were also locked out, so all the order could not be effectively marked as “shipped” even if we were shipping the orders in time. We expected some problems of “orders shipped late” to be discussed with Amazon once we would have been able to once again gain access and mark the orders as dispatched.

A littel after 24 hours the problem was solved and i was able to login again.
As soon as i logged i checked the order to mark all as dispatched but ALL the orders were GONE.
Disappeared.
I am even unable to find the order details by searching by order ID (like can be done when, for istance, an order is canceled by us.

I contacted the Amazon Seller Support to understand what is this case the fault, I don’t want to lose my money. They still have not replied in a definitive way on the matter. The case is going back and forth to different departments.

Since they didn’t warned us in any way that the orders were canceled (by them i presume) i presume it is their fault. Or is there a special rule that says that amazon can just cancel the orders whenever they want, giving no warning to the sellers?
Is there something that you would suggest us to do in such a scenario other than opening the case with amazon?

We are talking about around 450 orders dispatched, the loss would be huge for our company.

I would like some insight if any of you has a good knowledge of amazon rules or has experienced something similar.

Thanks in advance for any help you can offer.