Hello kushsayz,
Thanks for posting in the Apple Support Communities.
So, that we can help, it's good to know what device and OS you're experiencing this issue on.
iPhone- Settings > General > About
iPad- Settings > General > About
iPod touch- Settings > General > About
Mac- Apple Menu ( > About this Mac
Have you tried restarting your device to see if that triggers the upgrade to appear in your settings? If not, you may want to give that a try and see if it helps.
Also, how did you upgrade your storage plan? Was this done through your device settings? The article below explains your options based on the model device you're using.
Upgrade to iCloud+ - Apple Support
Once we have more details, we'll be happy to continue researching potential solutions. You can also reach out to Apple's account experts for additional help at Get Support.
Best regards.