You are not entitled to a refund, but I would call and make sure they have not cancelled your return. This will lower the chances of them profiteering unless the flight is oversold. Not all flights over-sell.
Mars is correct is sayign it might be cheaper to see if you can change the return flight to your new return date and pay the fee, than to let the booking go completely.
The airlines maintain a ridiculously opaque pricing mechanism which means that unless you paid thousands, you technically bought your ticket at a "deep discount". It is complete nonsense and everyone, including the airlines, know it. It is simply to allow them to rip people off when they are desperate to fly.
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