"automatic security algorithm was triggered" with a bitcoin transaction? This looks like a scamish reason to block an account. Better solve the OP request and release his founds or you can count with my negative feedback.
Hello r34tr783tr78,
We'll conduct our verification procedure based on the timeline and criteria we deem reasonable to follow.
Rest assured that we are examining the documents and details provided by John in the fastest possible way to make sure this issue will be resolved to the client's satisfaction.