Canara Bank — about refund amount from amazon

Address:

praveen chavadi mruthunjya nagar ranebennur, 581115

I have cancled my order duzo siwing hanging chair in amazon on 19th jan bt still i didint got refund amount.. I askd to amzon custmer but they saying we alrady refund.. Even they gave refernce number 964744.. So its alrady 10days wrking period but the canera bank custmer said we dont have any updates about that even i said refernce number also so kindly.. Rise the complaint and charge the dispute form.