PhonePe — gst number not there in invoice bill

Address:	Bangalore, Karnataka, 560001
Website:	www.phonepe.com

I booked a Bus ticket in phonepe transaction I'd was:S1807032305498893954923, Ticket id:83GXN2J5. I paid of rupees 1144.5 rs in the amount you cc charged 54.5rs for GST, but in the invoice bill there is no GST number. You cannot charge money without a GST number in the bill. Please find the below attachment
I want a bill with GST number in the bill otherwise I put a case on you. It's an offence. Iam waiting for your reply
Please resolve it ASAP..