Article 794 of Civil Code

If the insurance premium was determined taking into account considerations that would increase the insured risk, and those considerations then cease or diminish in significance during the term of the contract, the insured may, notwithstanding any agreement to the contrary, request termination of the contract without any claim for compensation, or request a reduction of the agreed insurance premium for the subsequent period proportionate to the cessation of those considerations, in accordance with the insurance tariff in force on the day the contract was concluded.