pctools.com this site shuts my pc down on a daily basis, sometimes while i am in the middle of anything, Internet

if you have iniated a free cleaning of your pc, you think it is done. but pc tools keeps shutting my pc down as if i have not finished the process.  i have emailed them to leave me alone, i get you are not a customer response.  d**n right i'm not a customer for the reason that my pc goes down and i lose info each and every and i mean EVERY day these jackals contact me to buy their crap.  Two emails to them to cease and i will see today, but i'm sure they will try again. told them i will contact ripoff report and here i am.  Anybody have any ideas how to dump this crap?