Are you a DEC, or do you have kids which will be joining you?
If any of above is yes then you will get a villa or temp condo or allowance, until a villa is available. Otherwise you will get a condo or allowance should you choose it...
It has been like that forever and they will not move from that whatever was told to you by someone in HR...
If they changed the policy it is your choice to accept it or not and wait for their response. Most probably it will be take it or leave it.
If it's an internal mistake or policy change that's not your problem and that's not what was agreed
If ATM coughs 2mil USD to you, do you think you can keep that money because of internal mistake?
Get angry....they don't like that in HR!!
That is exactly why you will not get anything.
Get facts and valid arguments
Have a copy of a policy sent to you, read it and see what is entitled