I suggest you call them back and chew out their service adviser for not researching the issue more. There IS a redesigned sprayer nozzle available that doesn't have this issue.
I know this because I took my car in 1.5 weeks ago to have them replaced. I did tell my service adviser that I was ware of a redesigned sprayer nozzle and that he should look out for one, and he had no trouble finding it, ordering it, and having it replaced.