The tellculvers survey offers simple rewards to thank customers for their feedback. After completing the survey, participants usually receive a validation code. This code can be used to get a discount or a free item, such as a scoop of custard or a meal offer, on the next visit. The reward may vary depending on the promotion or location. These rewards are not given instantly in cash but as offers that encourage customers to return. It’s a win-win situation where customers save money, and the company gets valuable feedback.