Ive have just received a 1200.00 for services i was basically talked into by a slick talking salesma

I have been subject to yellow pages bullying after I initially signed what I was told by the salesman was a one month trial but this was not on the recording they have of course. Only the part where I was agreeing to. At the time I was going through a difficult situation with the loss of both my parents 2.months apart. I believe that Yellow Pages has conned me and now I've received a bill for 1200.00. It was for a website that was suppose to be built but I agreed only to try it and told that was what I was getting. Now I don't know what to do