Gst input credit taken on purchase of vehicle.

Hello All,

I had buyed a car i vehicle on the name of my firm . i had mentioned my mentioned my GST NO. to the supplier. they had deposited GST into my GSTN no.
i had taken the input credit against same and filled my GST return accordingly.
I dad taken GST input against my GST liability in the month of May-2019.

Kindly guide me what can i do now.

Thankyou 
Gautam