Canara Bank — I didn't receive refund amount in my account

Address:

Soman Prathmesh, vendant millenea, B'wing',10th floor, flat no 1005, Soman Prathmesh, titwala, Thane, Maharashtra, 421605

I purchased product from amazon and zivame using debit card of canara bank, they initiate refund but the amount does not reflect in my account. I purchased product some 14 or 15 july they initiate refund 26 th july... And there is also some other transaction but i didn't get any amount in my account... They provide me reference number regarding this but no one help me... Please resolve my problem