Indian Bank — Regarding my refund amount

Address:

121 MRH road thabalpetti Madhavaram Chennai 600060

I have ordered a product in amazon on 10/08/2020 and I cancelled it the same day amazon gave me a reference number for cancellation and they asked me to check the status through my bank, I asked my home branch bank people to check the status and they say the number is invalid both the companies are playing with my money since two weeks and I didn’t even get a penny.please do the needful