Your after-service survey has a glitch

I'm stuck on your post-service satisfaction survey. On approx screen 5 I'm asked to check any of the listed aspects that I'm not satisfied with., There are four possible areas of dissatisfaction provided. None of them are relevant to my recent vehicle service experience and so I've not checked any of them. But, I can't continue because I am required to "Please select an answer to continue": How do I indicate my dissatisfaction with this impasse. Perhaps I should just check one or all of them and thus skew the feedback given? I wonder how many of your customers get this far, get stuck in the same way and simply opt out? See this survey page: https://ll-questions-web.azurewebsites.net/?customerReference=rogerj%40absamail.co.za&targetRef=52ZPM1D6&questionnaireType=sm-hyundai-service&utm_source=HASA-CRM-Prod&utm_medium=email&utm_campaign=HASA-CRM-Prod