Terminating an employee due to a conversation illegally recorded

Dear sir/madam,

I was working with a free zone company in Dubai and they terminated me based on an illegal record submitted by a customer within an hour by giving me one month's notice.

However, when I informed them that my contract states that termination is not before less than 3 months' notice, HR started threatening me with confidentiality and article 120, etc.

I need help to get my money because HR initially didn't see my contract and later when they checked after my email, they are trying to save their bosses money.

If I go with a case, can they add more accusations based on their claim? Or will the case be based on the termination letter which was handed out without any warning ever?

Please guide!

Thanks,