Ixigo — Issue on my flight booking - IF[protected]

I opted for "ixigo assured" while booking my ticket. But at the time of payment, amount deducted for "ixigo basic". And now, when I cancel my ticket, I'm not getting my full refund.
On contacting the customer service, they say that though you selected "ixigo assured", as the money deducted while payment was only for "ixigo basic", you will have no benifits of assured.
But how is this a mistake from my end?
Please look into the issue and refund my full amount.