Roblox double purchase bug

So in 2021 i was planning to buy 400 robux on roblox which is $5 and I clicked it and it appeared on my roblox account i have 800 robux balance which i only have exact $5 for one purchase and now I didn’t know i have $5 debt from apple which caused me not being able to download and reinstall apps which it always appears to fix your billing stuff like bro 😭💀