locked out of yahoo mail


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i have been locked out of my yahoo mail for 24 hours. just tried to sign in. i entered my sign in name, clicked 'my p/w doesn't work', they sent me a code on my mobile, i put in the code, they told me change p/w; i changed p/w, got a txt that pw had been changed, sign in screen popped up as invalid p/w. this happened over and over yesterday. so today i just stopped. HELP