I've been using Kraken since last year with no problems until 15.11.2018.

I've bought some BTC and credited my account. A few hours later I've tried to log in to check my account and make some trading but I couldn't log in! Every time I enter my login details the site gives the aforementioned error "invalid login". I was afraid and changed my password, but this didn't help, everything is correct but I cannot log in. I escalated the problem to Kraken support but I still don't have an answer. Yesterday in the support chat an employe has locked my account until the problem is solved but I didn't receive a confirmation mail.

Before my login attempts, my phone received a notification from Gmail with an automated email from Kraken for a withdrawal, but after 2 seconds this notification disappeared as if it were some kind of bug. Then I tried to log in and the whole story from above happened.
I checked my Gmail for a suspicious login but the "last activity" function is available only for the last 24 hours and I can't see the day before that.

I'm still waiting for a response, it's been 3 days with no answer at all and I'm very worried...