If TrapCall doesn't work out for me, can I just discontinue and cancel the service?

I keep hearing that TrapCall is good to unmask private and blocked numbers.See this website for yourself http://www.trapcall.com/?tp=0&gclid=COa-zcj0uaMCFUmA5QodSE7PbQ

Most said it really worked for them while only a few people said it really didn’t work for them and probably didn’t know what they were doing.I want to use it just for the first time because I keep getting private unknown numbers from a guy that says he likes me, I just want to unmask his private/blocked number with his real name.

I just want to know if maybe if it doesn’t work out for me, if I can just cancel/discontinue the service(it used to have a 30 day free trial but not anymore).And had anyone had any experience with TrapCall?