Employment termination & Cancellation of residence visas

I was recently terminated from work. My employment contract with the company, signed in March 2012, states clearly: on the resignation date of your employment, the employee shall remain under the work and residency visa of the company for a period of 3 months effective from the date of resignation or termination.

However, the company informed me that the recent changes to the law in the UAE since my contract was signed states that cancellation of employment visa and residency should be done within one month and that those changes supersede the wording in my contract.

Is this true? Or the wording in my contract is still valid?

Please advise.