Hero Motocorp — regarding billing of free service.

Address:

Kurji Induatrial estate road, Patna, Bihar, 800010

Hi.
I had given my hero maestro edge for servicing at authorised service center named Tirth Automobiles at 31st of August 2019. I did not receive any message regarding my vehicle acceptance for service or final delivery. All they did was that they provided me a receipt and a manual bill of Rs. 650 for free service. No measage was sent to me of the final amount.
I went and took my vehicle on the same day after servicing by giving them the receipt and paying the bill amount of Rs. 650.
And now on 4th of September 2019 I am receiving an sms stating my vehicle is ready for delivery and amout payable is zero (0).
Is this some kind of a joke. Is the company serious about this or is the software broken by some means .. Do something about this.