Ok I have a scenario here as well

Flying from DXB-KHI today, when my father checked in at DXB, they informed him that he will have to be downgraded from Biz to Eco because the flight is oversold! He protested but his options were limited as he had to get back tonight.

Now as compensation, they offered him
1. AED 200-300 worth of vouchers for spending at the airport after checking in
2. A free flight coupon for DXB-KHI in Biz.

He asked the agent at the counter if the coupon was for a return flight rather than OW and he was told , Yes. Then she looked puzzled and went to ask her boss who also confirmed it was for a return flight. Now going through the fine print he feels he'll only get a OW free flight but he's not sure, the rules aren't clear on the coupon he's been given.

He sort of feels cheated as he feels lied to but is unsure what he will get

Any body had any experiences ex-DXB of being downgraded due to an oversold flight ?

Cheers