[ARCHIVED] Hired sims don't appear

Hi there, unsure if i'am posting this in the right place. However i have had the sims 4 since september and have had no luck in successfully being able to hire a mixologist. I phone up and the notification says that they are on their way but no one ever turns up. I always look about to make sure they haven't been distracted. Then when i try to order a new one it says that there is already one on the lot. Ive tried phoning before parties, selected one on the plan a social event and by clicking on the bar itself but no one ever comes. please help me ☹️