Okay let me help feel better.
As long as you no go report duty on the first day still okay.
Even if they able to legally charge you, they wont do that because the cost for court and lawyer is higher than your 2 months salary (taken your salary is not more than 7K).
furthermore, you case will only be entertain minimum 6 months or can be after a year. So they wont go chase you unless you stole company information or something severe.
all these hassle will make them not chase you hehe
Note: after you send email declining the job just ignore their phone call or email.whatever they say dont care. as i said before they surely wont go for legal action to get a mere 2 to 3 months salary. taken your notice is that long lor. hehe
Cancelling an accepted job offer