I see this is a popular problem on Credit Karma - on many review sites it is described that hackers hack into accounts and simply take advantage of clients' money. In this case, the support service either does not respond at all or responds too late. I looked at the amounts that Credit Karma clients lost and against their background my losses do not look so significant. I'm new to Credit Karma and have the same problem - a hacker accessed my account and spent my money. It’s good that I came to my senses in time and only lost about 50 dollars. At the same time, I am surprised why CreditKarma bears no responsibility and clients are simply left without money. It makes no sense for me to contact a lawyer over 50 dollars, but if the losses were 2-3 thousand or more, as people write, I would have to do something - this is too arrogant business conduct.
I would like to recommend that you simply do not use the Credit Karma service, and if you have had significant money stolen, contact a lawyer, you should not get away with it.