Reviews are a hard thing to get people to do unless you pay a service to contact the people that used the product or service and have them ask the questions and log the users review.
I had a company that did just that and as soon as they stopped using the review service they stopped getting reviews of their company. Even with their own review program on the web site populated with all the reviews and does not require a login to place a review. They may get 1 or less reviews a month. But with the service every customer placed a review.