Yahoo changed password

I have had another yahoo accunt for years...And about 30 days ago I got an email saying that my password has changed and I did not do it...I have been tring to get a phone number to call and ask for help.. But I can not ever find one... I have found about 30 other people they did that to...And we have no idea why they did that....Min was a business account and now I have lost all my clients info.....Anyone know what happened??

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