Just rebook it, it might be taking the **** but you get the service you pay for and hermes is as cheap as it gets. The drivers are paid peanuts and work long hours that's why they don't care. It's best to use the parcel shops instead of getting them picked up if you ask me, at least you know it's going on the day you want it to then.
If I use Hermes I always use the drop off service and only send stuff that I can pack well enough to withstand their brutality. I try to only send indestructible things like books (unless they set fire or water on them lol)
Their delivery times are pretty good these days but I never use them for collection, but I hear the same complaints about other budget couriers like Yodel.