Bajaj Finserv — consumer durable digital mobile loan

I had purchased samsung mobile phone through relinace digital sector 83 gurgaon in 28th august 2019 with loan no.580cddfa476304, i was informed to get 3000 as cashback after paying 3 emi and now its complete loan paid but no cashback received, whenever i try to contact bajaj team they always give irresponsible reply that when company not giving us how we should give it to you. I hope they are doing fraud with cuatomers and if my problem not resolved within stipulated time, i would recommend not to use bajaj finserv for any purchase being cheaters in market with untrained staff.