Hi Nikita,
I had the same problem. I got the 5% discount instead of the 25%.
I called them and when i spoke to the customer representative he said that the promotion code was not submitted. But iam pretty much sure that i have submitted the code WW45JCE when i bought the voucher.
Now the Customer representative has put in a request which would take a very small amount of time like 7-10 weeks
to process that.
Bye
Murali.