There were 2 of them at the same match. One was +25% and the other one (the one you mentioned) +20%. Have you used both ?
Please check your betslip history, if you marked "+20% tick" while posting a coupon, the standard value should be crossed out and the boosted bet value should be listed.
Anyways just to let you know you should have a poker €1000 freeroll ticket for betting on this one. The freeroll is today at 19:00 CET