Late to this but the thread has arrived somewhere useful and I want to write down the general rule, because this exact shape recurs about twice a year here.
Why account refunds don't exist
The seller cannot distinguish a batch that was bad on delivery from a batch the buyer burned, and neither can the buyer, and both of them know it. In that situation the terms will always say no refund after use, and no amount of arguing changes an incentive. This is not the seller being unusually dishonest. It's the equilibrium.
What changes the conversation
Misdescription. Not "they died", which is unfalsifiable, but "the listing said X and the artifact says not-X", which is checkable by a third party. Marta_K got a partial credit the moment she moved from the first claim to the second. Everyone who gets anything back gets it this way.
So the practical version:
- Before warming anything, record the checkable properties of every account in the batch — recovery methods present, creation region, anything the listing made a claim about. Ten minutes, once.
- If a batch dies, diff survivors against casualties before you open a ticket. Go in with the difference, not the death count.
- Buy in batches small enough that the loss is annoying rather than structural, as paulofrz said forty posts too early for anyone to listen.
The part nobody wants
If a vendor's accounts arrive pre-linked, the fault is upstream of both of you — he bought them in a block too. Which means the good vendors aren't the ones with better terms, they're the ones with better suppliers, and you cannot tell those apart from a sales thread. You can only tell from batches, over time, at your own expense.
Summary: refunds happen for misdescription, never for death, and the ten minutes of recording before you start is the only leverage you will ever have.