What if I signed the agreement but then declined over the phone?

I signed an agreement but then while I was on the phone with the people who was basically going over with me what this company was & how the Rep at the door talked to me; I then started asking me questions then told them that I respectfully declined & that I didn’t want to continue on I was asked if I wanted to call customer service I said no. They said ok. However unfortunately I’d forgotten that I’d signed them papers & that the guy had a hard copy of it oh gee what did I do? God I pray that I wasn’t actually signed up & that by saying I respectfully declined that did it! Omgosh I hope it’s not too late.