Hacki g

i I was hacked into by someone that was a friend about a year ago. I changed all information. However, I still get unusual activity and strange things occur on my iPhone 6. For instance, I just happened to be going through my phone settings and hit the text message and then "blocked", under blocked were a list of numbers that I do not know and some from my address book. I took a picture and sent it to one friend that was blocked. He happened to recognize one if the unknown blocked numbers besides his current number. He told me it was a number he had a long time ago. I did not know him when he had that number. He was stunned. The strangest part of this whole incident is that we both know the hacker and he is still friends with him. I do not speak to him. AAlso, he was friends with the hacker when he had that number. I have warned my friend and he keeps saying that he believes me but he thinks the hacker is just messing around. However, after this incident he has changed his tune and is very nervous about this person gainin access to his money. I said how does it feel to be on my end.