Reliance Jio — False commitment about plans and rewards

Address:

JIO fiber service provider near sunaro ki dharmshala brahmpuri meerut

In my area (near sunaro ki dharmshala brahmpuri) jio service provider offers me to give the plan in 4000/- for 6month with 30mbps speed and set top box and as reward he commited to provide one year amazon prime membership.
I have paid him 4250/- online as he says that he will give 250/- cashback. after the fiber installation he is not responding to my calls. as a proof I have whatsapp chat screenshot in which he says he will login the prime on monday on another day and making false promises like this.