Parts of account lost

Just playing normally then it told to sign in, then well I clicked sign in and it just cleared and my name wasn't showing it just said steve well I went to go click on my skyblock world and it said sorry you don't have skyblock please purchase "here" and im not gonna pay for something I already payed for I need my coins and the skyblock pack back because I paid for it and its not just gonna disappear and waste my money