Has anyone used tesco vouchers to pay for Haven holiday site if camping ?

[fakeblonde]

I have exchanged and got in my hand £165 00 worth of Haven Holiday tokens now.
On the onternet the price to camp for the week is £238.00 which it says includes a saving of £112 .
Now ive just read in the smallprint that vouchers can only be used on the brochure price NOT discounted or internet prices. <br /> In which cace im going to pos have to cough up £170 anyway !
Why do they do this ?