Company availability

If they have asked for money, assume it's a scam

Also - Did you apply or was it a random email?
If an email, it's a scam

they have got my contact  from a job website, I got notification from the site, then received email from the company containing questionnaires and asked for my CV, later received a formal job offer with signatures, UAE stamps of ministry of interior and chamber of commerce. in the end of job offer they ask to contact a specific agency for visa and work permit.

A very common scam.
They as for visa money - If you send it, they ask for more.
There is no job.

However, post the website and email addresses, but leave out @ and . - Just pop a space in to replace them

are you living in Abu Dhabi now?