Samsung — They delaying refund for the order I cancelled

I placed a pre-order on galaxy buds 2 pro along with wireless charger from the Samsung shop app order no.-[protected] on 21st August 2022. Though the app showed that I received a cashback of Rs 3000, I was charged a full total amount of Rs 17999 for my buds and Rs 499 for the charger amounting to Rs 18498. Hence I cancelled the order hoping to get the proper refund within the pre-order offer time and be able to re order it again for th proper price. But all I have ever got until now is a partial refund of Rs 499 for my wireless charger. The major bulk amount of Rs 17999 hasn't been refunded yet as of today 2nd September 2022 which is already 11 days since I ordered. Not only did I miss the pre order offer for the buds but also I am quite devastated because that's quite a lot of money still stuck somewhere. My faith in Samsung support is wavering because even after numerous calls and emails there has been no solution and I am feeling hopeless. Please look into this matter from your side I beg you.