VROL is a service for dispute resolution provided by VISA. Its goal to collect and forward relevant information regarding a dispute. VROL assist with disputes validations using gathered data by comparing information such as dispute category, transaction data, merchant response.
For instance, you have already covered customers claim, refunded the transaction in question, settled by offering a subscription discount, etc. In such cases, VROL will flag this claim and expel this dispute from counting in the chargeback rate.