account blocked and deposit requested to unblock account

I tried to sell p2p dollars but due to a disagreement with the buyer I decided to cancel the sale.
support asked me for my password to make the disbursement and blocked my account, a few days later they told me that the funds had been withdrawn and they did not unblock my account. now they are asking me for 540 dollars more to unblock the account and disburse the funds from the sale but I am not sure if this is necessary.
What should I do?
this all happened by mail:

Hello @archean-agamont-2,

Thank you for joining the community and for leaving us a comment.
We are truly sorry to hear that you have faced such an inconvenience.

Kindly be reminded that our customer support does not request clients’ account passwords.
Please know that we would need to check further on your issue. Therefore, kindly reach out to us via LiveChat, for better assistance and protection of your account’s data.

We’ll work with you to resolve any issues as quickly as possible.
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