HDFC Bank — non receipt of fastag or the refund of cancelled fastag

Address:

26, 2nd Main, Vijayashree Layout, Kodichikkanahalli, Bangalore, Karnataka, 560076

I had applied online for HDFC Fastag via Appln# HFR175275 dtd 5th July 2019. Payment of Rs. 500 made through Standard Chartered Bank. I have neither received the Fastag nor have I received the refund (As instructed by Customer Care, I cancelled the Fastag). I have sent 4 to 5 emails to fastag.[protected]@insolutionsglobal.com, but no response and no proper response from the Customer Care as well.