I already withdrawed money am I safe?
No, you're not. As has been said, you MUST read eBay's guidance on payment disputes. Having withdrawn the money is no protection.
Claiming not to have recognised a payment is just one of the many ways in which buyers can defraud sellers on eBay. Ignoring the claim and doing nothing simply means that eBay will take payment from your bank account to refund the buyer's credit card company - and charge you a fee for administering the refund.
You may hopefully have the delivery proofs to qualify for eBay seller protction, but only if you get yout had out of the sand and respond to the case.