iOS third party crash.

Dear Apple,

My iphone 6 plus running on IOS 8 has recently crashed when I was on safari, but it was only the safari app not the whole phone and it also didn't let me open anything in safari. It said to call a number toll free, so I called it and some guy with a accent said am I using iphome or iPad i said iphone but then he was like are you calling from the device that crashed I said "yes". But then he said hold on line and then came back and said there was a one time fix for $80 and I thought $8 so then he said no no no $80-$90. Then I was thinking $80 no way this can't be real, so then the guy asked me how old I was I didn't want him to know I had a credit card so I said I was 15 then he said oh go to your local Apple store and hung up. I was confused then I was thinking so I went to settings safari and then cleared my history and search then it was gone. But they habe my phone I don't feel safe with that. So I have come here to the forum to ask you guys that have maybe experienced this for some further information. I don't know if they still have a virus in my phone or something. If anybody can give me more info about this please give more info about this I just don't feel safe about wbat happened. Thank you!