There's definitely been an increase tt11's prices, but not 20-25%. I would say about 10%.
However what is decreasing is the level of service:
For some time now, they've been sending out their orders with TNT instead of DHL Express to save money, even in the cases where the amount of order entitles you to free DHL Express shipping.
In fact, although they advertise DHL Express shipping in their website, when proceeding to checkout they've added this clause "We reserve the right to use other express mailing services without prior notice" just to cover their asses when shipping with TNT instead of DHL Express.