Paytm — Didn't recieve cash back on my paytm wallet

Address:

Bangalore, Karnataka

Had ordered Venus Purple Electronic Digital Personal Bathroom Health Body Weight Weighing Scale from your Paytm. order #[protected]. Was been shipped via Ecom Express with the tracking #[protected].it was a cash on delivery.we paid 659 rupees on delivery. While ordering we had applied a promo code and still i didn't receive the cash back amount back in my paytm wallet. Please take action on this complaint.