Social Boost by AppsMav

Is my first time using this app for a giveaway and I had a concern, I pull up the chat window and in a couple minutes they answered all my questions. Needles to say great app and awesome support system. Well my first experience was good, but now I wanted to contact support for a question about their plans because I can find the answer on their plan page and I have sent 3 emails and one chat window in 3 days and nobody has contacted me yet. Can somebody tell me when and how I can cancel a plan subscription? I cant fine the answers anywhere and they are not replying to any of my messages. Thank You.