Just to let anyone know who has had the same problem, I found how to fix it. This isn't a error with the game, but a hack. You can tell if the hack is on your comnputer because when you click on a phone, one of the interactions is to "set ringer". I fixed my problem by downloading the hack scanner from www.djssims.com
and deleting the hack called "phone hack". May seem simple, but I couldn't figure this out for the longest time. Hope I helped somone having the same problem!