A weird Chinese verification code from Instagram

Hello.
I recently have bought a number (5 or 4 months ago)

And i dont remember using this number to sign up into an Instagram account.
Weirdly couple of days ago i received message written in simplified Chinese saying:

"****** 是你的 Instagram 验证码。请勿分享"(original)

"****** Is your Instagram code. Don't share it"(translation)

I received the message twice.
Then i wanted to check whether this number is linked to any account or not.

I created an account using that number, received a couple of verification messages then created the account successfully, i thought its not that serious so i deleted the account and forgot about it.
After a day , i cancelled the deletion just to check one last time and to unlink the number of the account. I linked it to a burner gmail of mine, and that was just to make sure that the number will always be clear with no accounts attached.
Then i deleted that account.

Now after one or two days of deleting the account thats unlinked to my number, i suddenly received a message again seemingly it the message was meant for another account thats been created on my phone number it says:

"*We locked your Instagram account for your safety*
To recover your account, you'll need to verify your identity and create a new password."

So i really dont know what to do, please help check whether the number has any accounts and permanently delete them i don't know what they're being used to or if the account ever exists.