Hyundai Motor India — invoice not provided after service and seat matting missing after service

I am bhagwat singh using grand i 10 sports registration no. Rj 24 ca 4188.
I take my car for paid service at the service camp in beawar organised by shivam hyundai ajmer on 11 mar 18.
After service i found that seat matting is missing from my car. While complaining regarding this, advisor mr. Hemant told me that it may be installed in some other car by mistake. And promised me to provide it in next camp on 25 mar 18. Also he took rs. 3100 and said that invoice will be sent to e-mail id on next day.
But even after many follow up they are not providing the invoice and seat matting.
Also the amount showing in my hyundai service app is rs. 2890. I feel that they have cheated with me.