Things have changed a bit since I was doing business banking, but we used to offer different charges, the cheap version didn’t have any branch support- counter service was basically an extra. In practice, I always blurred the lines a lot more than that, as long as a customer wasn’t taking the piss we’d help them but yeah, they might get a similiar line to you “We’ll do it on this occasion, but do be aware, you’re not supposed to do this” sort of thing.
(same applies for personal accounts too, people would take out the internet only account to get the high interest, then expect to use the branches anyway)
Santander seem to be the shittest bank in the world though, just closed down my savings with them