Ajio — Refund not settled

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Hi,
I have placed an order by paying the full amount shown on the final page.
But some of the items on the order are canceled and returned.
Received lesser amount than expected. When checked with customer care, they told due to a technical issue we received a lesser amount, and the balance adjusted from canceled and returned items.
If they receive a lesser amount they should have canceled my order.
They accepted my order and send some of the items on the order.
Now due to that, I am paying more than the amount shown on order page for the items they sent. which I don't want to pay. if they would have shown amount is high for a product I wouldn't be buying.