[helen842000]

What contact has been made with the company?

Evidently they never expected for the use of your resume to come to light.

They obviously want to use it! Why not drop them a mail and say you've seen that they're using it. Advise them of their 'choices', if they want to continue using it they need to add a disclaimer to confirm they have not hired you, also include details of your (very large) fee for continued use. 

Alternatively they can remove it and just pay a reduced fee for the time they have used it so far. After all, they have no affiliation with you - they are just using it as 'artwork' for which you should be paid.

I'd make sure the first contact with them is civil. they'll probably be sneaky & just take it down but you never know, taking the official route & spelling it out for them might produce benefits!

If they don't comply, you can always take it further. You can even say you approached them reasonably!