I don't know if this is related but there was an incident with Kraken earlier in the year.
There had been a leak of private information of Kraken customers after a server used by a firm called Etana Custody was hacked back in April. Etana is a company that Kraken and other exchanges as Binance use to outsource some of the management of the fiat accounts.
https://cointelegraph.com/news/users-funds-are-safe-following-reported-etana-custody-breachWhile funds are reportedly safe, the firm notes that users’ personally identifying information including names, email addresses, physical addresses, and phone numbers may have been compromised.
I remember that this incident wasn't discussed at all back in that day.
The leak was probably sold to scammers, so maybe they will try to reach some people, and sometimes some weird phone calls can happen from foreign countries or IP numbers. Even if Kraken didn't have your phone numbers these can be found so be careful.