Can't buy arena shop. (Grand Theft Auto 5)

If steam version - go to the library - Grand Theft Auto V - RMB - Properties - Local files - Verify integrity of game files - press,waiting for when I finish the test. If SocialClub version,exit and re-enter the account. Try to buy again,if not helped,please contact our technical support Rockstar. These methods which I have described,is on the site technical support Rockstar.

Time cannot be bought - so no need.