phishing help

I received a pop up message stating that my phone was locked due to illegal activity. I called the 877 number from a landline. I was told that someone was trying to perhaps get banking information. They said they were from apple support. I foolishly gave them my apple id. They then said i needed to get an itunes card in order to get the necessary download to my phone. They said the cards were available in $25 to $1,000 denominations. I did not share my password with them. They asked if they could stay on the line. I told them I would have to call them back. Do I have anything to worry about since I gave them my Apple ID?