Uco Bank — refund amount not received till now

Address:

Singjamei, Imphal West, Manipur

I have purchased an item from amazon.in and the item was lost in transit, so i had to cancel my order and go for refund. I went for refund and amazon.in has also initiated the refund providing me with the reference no. Of the refund but the amount was not credited to my uco bank account till now. I also called the bank's customer care but they are simply ignoring my complaint stating that they are not handling these type of issues... What shall i do now???