Asking an employee to pay all allowances back in case of resignation

Hi all,

I Have a problem. I talked with HR today as I want to resign. He told me that I need to pay all allowances back to the company (home allowance etc.)!

When I checked my contract, I saw that it is mentioned that I should pay if I leave the company, but this is just the contract I signed online from a website.

I've also signed another contract with my wet sign (which is Arabic written also and sent to the government, I think) before signing another one, In that contract, nothing is mentioned like that. So is this legal?

Can they take allowances back?

Doesn't the official labor contract prevails over anything else I signed?