Complimentary Hotel Stays

Hi I was so happy to receive a complimentary stay at the Carousel Casino...but when I wanted to make my booking I was told I can only book from Sunday to Thursday.....I have a full time job how can I book during the week??? It is really terrible to dangle this carrot in front of my nose....I am very dissapointed and hope that this can be rectified. I have played a lot of money at Carnival City, Sibaya, Time Square only to get this offer? This is truly dissapointing....I also see the offer at Carnival city is also only for Sunday to Thursday booking I mean seriously?