how to stop a hogging webpage from xfinity

I can not click on a petiton or survey from one of my emails without xfinity jumping and hogging the whole page.  It says my name and offers me the free TV for 30 days.  It has all my specs for the prepaid boost xfinity internet I purchased.  What is it a bad certificate.?  Who do I hire to stop this twilight zone thing I'm in. $$$$