The following are my recommendation/suggestions:

1. Look for the company's name on Qatar Business
Directory(published book) or Q-tel Business
Directory (on-line). There are yet other e-yellow
pages available on line. Just be sure you got the
exact company name.
If the company is legitimate, for sure they have
telephone numbers/contacts/e-mail address/web site.

2. In any case you are directly dealing with a company
representative, you can ask the telephone number and
call them directly.

3. After you have called and still not convinced, ask
the office location and visit them.