Amazon India — refund from amazon india not credited to my sbi account

Address:

Nit patna, ganga hostel, Patna, Bihar, 800005

I returned my amazon order which i have paid via upi id and according to them my refund was initiated. I never got my amount credited to my account. Amazon customer service is so poor. They just gave a refund reference number[protected] and said they can't do anything more. They asked me to contact my bank. I contacted my bank customer care. They were worst in cooperating. I called them three times and every time they denied to take my refund reference number and said they don't know what refund reference number is. They said it's all amazon's responsibility and they can't help me in any way. Amazon is asking me to talk to bank and bank is asking me to talk to amazon. And now i just don't feel like having an sbi account or do any online shopping through amazon.