Using API OF GPT-3.5-turbo but billing cost from GPT-4

i am using API of GPT 3.5 turbo but billing cost was from GPT-4. how it is possible.
plz let me know if any one have faced the same problem before.
and also guide me if i have done something wrong that i need to fix.
thanks

You likely used some scam extension, website, or software, that stole your key and emptied your account.

Tell me where you found this software or site so I can go kick some a**.

Do not give your API keys out.

did u find any solution? because i am also facing this issue.

i contacted the GPT help center. they told me that your key was stolen. key was hard coded than and now i put my key on firebase firestore database. there is still risk of theft but minimum. also you can change key whenever needed.