concerned that app has caused issues

Hi, I installed this app and it unwantingly added a url address to all 4000 of my contacts. It also blocked the use of LinkedIn calendaring mobile app. Then it refuses to be uninstalled constantly rebooting my phone and/or hard locking it up. I tried to delete it several times but, it still works in the background adding urls to your contacts. I also re-installed it again and tried to uninstall it after turning off all other apps.It has been very frustrating to me because I use other apps that it is now blocking and it is causing my new phone to malfunction repeatedly whereas prior to installation it worked fine. I am working with support now but, they tell me a fix is not near.

JmiBean1 about I'm Busy SMS Sender