peachfront

I received a $200 voucher for being bumped off a Delta flight in June. Believe you me, I have learned my lesson. Never again! I have spent an hour trying to book a flight using the voucher on Delta.com. Even the "chat" person could not figure out how I could enter my number so that I could receive the discount. She finally said just to call the customer service number. Of course, there is a fee for booking online instead of on the website. Is this just another Delta "gotcha?" The "chat" lady says that she can see that the value of the voucher is $200 but the website says that the voucher has no value remaining on it. I feel very ripped off. I tried to do a nice thing by taking a later flight and I've had nothing but hassles trying to use this coupon. Can anyone help me? Thanks.