Bajaj Finserv — no cancellation of my emi and deduction of money from bank

On 20/3/2020, i ordered a phone from amazon i. E. Vivo u20 through bajaj emi.
But due to lockdown, my order was on hold but suddenly i got a message from amazon that my order has been returned to the seller on 28 april 2020 and order number is 406-[protected]. On 29 april, amazon sent me a refund reference number (Cs[protected] which i forwarded to bajaj along with the invoice which was provided by me from amazon. But bajaj customer care replied to give the cancellation mail from the seller to them on 5th may. Again when i contacted to amazon customer care they told that i have to only submit the invoice provided from them and a mail that was given to me in which they written about the product's status that it was returned to seller. I forwarded it to bajaj but they still are telling me the same email to provide cancellation mail. I even tried to contact them through their customer care number but all in vein, they didn't pick up the call everyday i try to call them. My phone's price was rs 11990 and the emi that i have applied for was of rs 1999 for 6 months from which bajaj had already deducted the money since 2 months and a processing fee of rs 140. I don't know why they are doing such nuisance since i already provided all the details about my cancellation. So i hereby request you to please help me in getting my hard earned money back and file a complaint against bajaj finserv.
My loan number - 4c1ecffy203146
Muna behera
[protected]