Can I quit the job if I didn't sign any documents yet?

Hello,

My question is: I went for a job interview in Dubai based very small company. They gave me an offer only verbally (no offer letter, no signed contract), I accepted.

I worked for 2 days only because I did not like the job. I have also given my passport copy (only 1st page) and my visit visa copy.

Now company owner says my visa is under process.

Can I leave this job now? Can I go back to my country?