Another persons emails have been sent to my account.

I received an email saying that 'the previous email account had been changed' It displayed another persons email address at the old email but then should my email address as the new email address. I am not this person and have not ordered anything or changed my email address. I now have several emails that should be going to this other person but are coming to my email address. These emails contain account numbers and order confirmation numbers. I tried contacting the company sending the emails to explain but they said they couldn't do anything about it. I now have a lot of emails being sent for this woman to my account and don't no what to do. Please help.