Spice Jet Airlines — Reschedule problem

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I have a flight on 8th oct dxb - hyd, return flight on 18 oct hyd - dxb.
I want to reschedule my flying date on 28 oct dxb - hyd and return flight on 8th nov. Their is a flight on 28th oct dxb - hyd but there is no flight from hyd - dxb whole nov. That is spicejet mistake. Atleast in this case they have to give full refund for return flight. But they marauding my money. More then as regular cancellation fee with the name of flexi. If spicejet is really care about their customers they have to give explanation about it and with my money.
Thank you.