[Resolved]  Croma — order cancelled without my consensus

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

I bought a google mini from croma online store. I was given home delivery option. After a few days i got a call, they said that i need to pick this up from store.
So i bought a chroma card as i had a few award points with me. After i reached at the store, they said the croma card cannot be used, i asked for reasons, and for that they said please come back tomorrow. Next day i recieved a call that my order has been cancelled. I bought the google mini in sale, now i have to make the full payment to get the product.

I would like to know the reason of all this. And, why my order has been cancelled. I had to half day from office to got to the store, and see nothing going fruitful.