You can write to b.peace@ewsllp.co.uk or  j.saxton@ewsllp.co.uk and make sure they send the legal form for proof for you to fill out, and then send them all the evidence you have. Screenshots, passwords, old emails from Mintpal/Moolah, username, 2fa, etc.

You can also fill out this survey so they can get a better picture of how much was stolen vs returned

https://www.surveymonkey.co.uk/r/8GSBZJP