Can anyone help me? I am so frustrated!!!!! I have a Mac. I do some shopping online

and recently when I access any of the different store sites, like Qvc, Crate & Barrel, Pier 1 etc, the minute I click on something on their opening page I get a survey. It's from a company called "oficialsurveyscenter.co". That is the correct spelling, only one "f". I have never taken the survey when it comes up. There is no "Unsubscribe" in the Terms and Conditions, which is a mile long. I know this is my fault. Somewhere along the line I must have click on something that started this nightmare. I googled "unsubscribe from oficialsurveryscenter.com" but it only brings me to there Term & Conditions page. Any ideas how to get rid of this. Any help would be appreciated.