Erase iphone

You do not need iTunes to erase an iphone.

Wipe all content and settings from iPhone

1. Go to Settings > General > Transfer or Reset iPhone. If you're erasing your iPhone because you're replacing it with a new iPhone that you have on hand, you can use extra free storage in iCloud to move your apps and data to the new device. ... 
2. Tap Erase All Content and Settings.

Erase iPhone - Apple Support (IN)

You may Contact Apple Support

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Apple Support Community Forum

This is Apple Support Community forum, primarily for a user to user interaction for information & idea sharing between users, if need be, extend support on technical know-how in handling Apple products from a more experienced fellow user, This is not the right forum to discuss with Apple Inc.