hi i cant use snap chat is disblied for mobile

Snapchat is very strict about enforcing its Terms of Use. This link explains their procedures and enforcement strategy→My Snapchat Account is Locked.

But basically, When Snapchat bans a user they also ban the device that was used to access Snapchat. If it wasn’t a permanent ban your account will be usable after the duration of the ban. Otherwise you will never be able to use Snapchat again from the device that was banned, and if you try to access it with the same account or information that can be associated with that account (such as name or phone number) from another device, that device will be banned also.

Contact Snapchat and ask them, this is not an Apple product.

Here is a link to their help page.

https://support.snapchat.com/en-US

but my mobile is blocked snap chat not singn in

Yup, that's a Snapchat issue, they are the ones who are blocking you, not Apple. Contact Snapchat.