Unable to log in. [Pre-order "Buy it now" Bug)

I bought MCG 26th May at 3 am (GT+3), I successfully downloaded the working version of launcher (took about 1 hour to do so), and now instead of PLAY button there is Buy now button. What should I do? I already tried to exit and join my XBOX LIVE account

Please return my money back or help me log into

 

Also here's a screenshot of minecraftdungeons site where I've purchased Minecraft dungeons standard edition