AVG software is free but when you uninstall you have to pay or it won't uninstall! Internet

I took downloaded AVG for free to try out their security software and then at the end of the trial month I did not purchase the software. Now I have free security software that is included with my internet service by my internet provider. They advised me I needed to uninstall AVG and Norton in order to download their software. I went to the control panel and uninstalled Norton without a problem and when I uninstalled AVG it appeared that it was working but never uninstalled. I have tried at least 5 times to uninstall it and it never actually works. I was advised by my ISP to contact AVG for assistance in uninstalling. I called AVG and they told me that I would have to pay a technician to have it removed from my computer. They transferred me to their tech buddy's who charge $49.99 to log into your computer remotely and remove the program for you. They said if I didn't want to use their technicians I could go somewhere and pay to have it removed. I have never in my life downloaded something advertised as free and then had any issue trying to remove the program from my computer and then be told I have to pay to have it removed. If I would have known this upfront I NEVER would have tried their software in the first place. So I would strongly recommend anyone that hasn't tried their "free" security software not to try it unless you want to pay for it when you need it removed.