Hello,
Please refer to the troubleshooting steps below:
“Where are my Robux?”
https://en.help.roblox.com/hc/en-us/articles/360029481932-Where-are-my-Robux
If the issue is not resolved after following the steps above,
scroll to the bottom of the page and select “Need more help? Contact support here.”
From there, you can reach out directly to the support team.