My Bono is not Bueno

Over the last four years I have visited Bilbao on several occasions and always stayed at the Hotel Puente Colgante which is situated in Portugalete on the riverside next to the eponymous bridge. On my second visit I noticed that one of the locals was having his fidelity card stamped at breakfast so I asked for, and obtained such a card for myself, much to the amusement of the locals. 

Over the next three years I assiduously collected the necessary stamps to entitle me to free breakfast and successfully filled the card last year.
So, this year, with a great flourish I presented my bono at breakfast and claimed my two free breakfasts.

'Sorry, that promotion finished eight months ago.'

My bono was not bueno.