Swiggy — Changing of my shift

My self bhavik, I am working as swiggy delivery boy. My de ID Is[protected] city (gurgoan). I had raised a ticket regarding change of my shift. I got a confirmation call from swiggy but they gave me some other shift which I don't apply. I fill many de form, writes many mail but they are not giving any response. Every time they just there is no vacancy. How is this possible if their is no vacancy then how they will join the new riders. They lied to me everytime. They just want the money which they take at the time of joining. I requested him to please change my shift as soon as possible.