Osmania University — Changing your subject

When I took admission in clg in aug I took Ba plp..now in Dec when the classes has started instead of teaching political science they are teaching us computer applications..in which I have no interest..when I asked them to change the subject...they said that Osmania University has changed it in only ms...how it will be possible..and how will they not inform us even after our admission.they are having our mobile numbers email ids everything but still they didn't...now even now they are not responsing please we want our subject computer applications change into political science or history