When i had my timing belt done they tried to do the same thing, they tried to say that its in the service manual that it need to be replaced, well i went to work the next day and as i work in a shop That services some gm trucjs i had access to the gm service docs, i printed off the procedure went in and created a real big fuss in front of 30 or so customers, they didnt like that and ended up not charging me for the new pump and seal. Some times you just have to make a real big fuss, kinda like when you were a.kid and a temper tantrum just way more civilized lol