Ms/Mrs/Miss problem revisited

Hello everyone,

I know there have been posts concerning the proper way of addressing the employer in case their marital status is unknown. My problem is slightly different - I haven't stated my marital status in my cv (I am not married), and my future employer is addressing me as "Mrs". Well, it doesn't bother me very much, but maybe he is expecting me to provide this information about myself now that he decided to offer me a job? I am Polish, the employer is American, I'm not sure how he expects me to behave (maybe it is improper for a younger person to say which title should be used to address them?) and that's why I ask your opinion. Thank you in advance!

Yours,
Agnieszka