Reliance Digital — Reliance Jio, I am complaining about overcharge

Address:

Dharwad, Karnataka, 580021

I purchased reliance jio wifi dongle in exchange of my old tata docomo dongle from reliance digital vidya nagar hubli branch on 25/06/2017 4:00pm. My total bill was supposed to be rs. 1407 but instead they charged my card with rs. 1999 when asked to return me the extra amount they said they cannot do it and will instead give me a gift card. Since it is not my mistake i asked them to give back money. I am waiting in this store since last 2 hours! Take an action immediately! I will sue you this branch and company in consumer forum otherwise!