How do I delete a hotmail address that was incorrectly typed. I can sign in with the correct address but the wrong one keeps popping up aswell and I would like to delete it ?

they call upto 3 times a day and say they server keeps gettin warning alerts from my computer.and tryin to say how to sort it????? is this a hoax ???? they also ask for money near end of call... get quiet rude on fone aswell..say things like ...madam how wud i know about warnings and why would we keep calling

 

and telling me there call centre keeps getting warnings from me computer is this an attempt to hack my computer...an wud microsoft really be phoning me???